OzCableguy's Router FAQ
1.0 About Routers
2.0 Using Routers
1.0 About Routers
1.1 What is a Router?
1.2 What other features do they have?
1.3 Why should I get one?
1.4 How much do they cost?
1.5 How do I know which one to buy?
1.6 Where can I get more specific information about
1.7 Can I buy one from you?
1.8 What else will I need to use a Router?
1.9 My ISP tells me that my modem or Router is not
supported. Can I still use it?
1.10 What Routers support XBox Live! or Playstation
1.11 How do I connect XBox or PS2 wirelessly?
1.12 Why do some Routers have different version numbers?
1.1 What is a Router?
When speaking about computers, in layman's terms a Router is a device
that goes in between your modem and your computer (or Network of Computers)
and shares the Internet connection to as many computers as you like using
a process called NAT.
1.2 What other features
do they have?
There's barely a Router on the market now that is just a Router. Most
have various extra hardware items & features built into them including:-
Switches (to plug multiple PCs together)
ADSL modems* (so you don't need a separate modem)
Print Servers to share a Printer without relying on another PC being
Wireless Access Points so you don't need a separate WAP to connect
up PCs wirelessly
Serial Ports for ISDN or Dial-up failover
Advanced (Stateful Packet Inspection) Firewalls
VPN servers & clients
Content Filtering (Parental Control)
Logging traffic and attempted security breaches
Traffic Shaping (QoS)
* Products are available overseas with built-in Cable modems, but they're
no good here because the Cable ISPs only allow certain modems (that they
supply) on their Networks.
Note: Products with built-in ADSL modems are unsuitable for cable
and at this stage there is no such thing as a Router with a built-in ADSL
modem that can be used for any other type of Internet connection other
1.3 Why should I get
Routers are secure, easy to use and reliable. A basic Router on a small
Network will take an hour or so to install and keep plugging away happily
for years. Attempting to achieve the same result with software methods
can often take days (at the expense of much hair and sleep) and still
be nowhere near as secure or reliable.
They can't be fooled by viruses or Trojan Horse programs, and because
of the sheer number of different brands and models available, it's unlikely
for anyone to come up with an exploit to affect them.
1.4 How much do they
Simple Routers start from around $50.00 and go up as high as you like
depending on the size of the job it needs to do, and extra features you
may want or need. For the most part, the more you spend, the more you
get. More expensive Routers are generally a lot more powerful to cope
with larger sized Networks or more advanced Internet usage like multiple
1.5 How do I know which
one to buy?
Do a little research first, and consider the following :-
What Broadband type have you got?
Does the Router include specific support for your Broadband type?
(eg BigPond Cable. Optus just requires a Router that supports a "Dynamic
IP" connection type which is available on every Router I've ever
Do you also require a modem? (There are many Routers that have built-in
ADSL modems which usually provides some cost saving over buying a separate
modem and router. Just bear in mind that these aren't suitable for Cable
If you have a separate modem, is it going to be compatible with the
Router? (eg Routers generally need an Ethernet modem. USB modems are
usually not suitable, so if that's all you've got, you'll need to upgrade
the modem or buy a Router with a built-in modem).
Note: Some modems like the Motorola SB4200 Cable modem and several
ADSL modems have both USB & Ethernet ports and these are fine to
use with Routers as long as you use the Ethernet port.
What applications do you commonly use and is the Router configurable
for these? (eg MSN Messenger requires UPnP support for Voice, Video
and File Sharing, and Remote Access applications like PCAnywhere will
require some port forwarding)
How common is the brand & model within Australia in order to get
support and warranty claims?
How long is the warranty?
Does the manufacturer provide local technical assistance?
Check out my Find-A-Router tool,
check the manufacturer's websites and try Googling
for other reviews.
What are other people saying about the product in forums like Whirlpool?
Generally, start with the cheapest products and compare them to the more
expensive models or brands to see if the extra features and capabilities
are worth the extra money for you, and then compare the various brands
to each other and you'll usually find one that will stand out.
1.6 Where can I get
more specific information about various products?
See my Find-A-Router tool for feature
summaries, prices, ratings and links to manufacturer specifications, wikis,
forum discussions and more.
1.7 Can I buy one from
You certainly can. I set up an online online shop at www.shop.ozcableguy.com
specifically for this purpose where I have most of the best products available
and can have them delivered usually within 24 hours.
Using a combination of working from a home office and a unique system
called "drop shipping" (where goods are sent directly to my
customers from the manufacturer's distributors) means that my overheads
and prices are kept very low, while still being able to offer a reasonable
amount of technical assistance as required.
1.8 What else will
I need to use a Router?
Each PC will need a Network card and a patch lead. Patch leads, also
known as Cat5 cable with RJ45 connectors, come in two forms - Standard
and Crossover. Crossover cables are only used to connect 2 PCs together
without a Router, or to uplink a Router to another switch (if no crossover
port is available on either device). With few exceptions, the cables that
go between the Router and the PCs will be Standard Cables (The Billion
711CE/7100Pro & Netcomm NB1300 are exceptions. These use a Crossover
cable in the same situation.)
With Wireless Routers, you'll need wireless network cards for the
PCs you want to be Wireless. Bearing in mind that most Routers with wireless
capability also include a built-in switch so you can also plug PCs into
it with cables and they'll all talk to each other exactly the same way
irrespective of whether the PCs are wired or wireless.
1.9 My ISP tells me
that my modem or Router is not supported. Can I still use it?
When an ISP says they don't "support" something it doesn't
mean it won't work. It just means that they can't (or won't) give you
technical assistance to make it work. The last thing an ISP wants is to
be put into the position of Network Consultant and then be sued for giving
incorrect advice. Their responsibility ends at making sure your Internet
Connection and any equipment they supply works.
1.10 What Routers support
XBox Live! or Playstation 2?
Just about anything will work, as both of these game consoles have an
Ethernet port* just like a computer and pickup the settings they need
automatically from a DHCP server (the Router). Pretty much all you have
to do is plug them into the Router using a straight through cable and
away they go.
* Not sure if the PS2 comes with the Ethernet adapter or if you have to
buy it separately.
Features to look for are UPnP support, and in the case of BigPond Cable,
a built-in login client, particularly if you won't have a PC somewhere
to maintain the Heartbeat.
XBox have published a
list of Routers that do and don't work with XBox Live!, but you'll
notice most of the products listed as not working have workarounds. In
these cases XBox may also be being a little harsh on these products and
they may have been listed as "bad" due to the manufacturer's
implementation of the UPnP protocol and these Routers may work fine with
a single XBox but may not work very well with multiple XBoxes on the same
The same list will be fine to use as a guide for PS2s.
1.11 How do I connect
XBox or PS2 wirelessly?
have a Wireless adapter for the XBox, all you need for either the
XBox or PS2 to connect Wirelessly is a "Wireless bridge" (in
client mode) and a Wireless Router or Access Point that shares your broadband
Linksys have an 802.11G product called the WGA54G
and D-Link have the 802.11G DWL-G810
at the time of writing. Most other manufacturers have a Wireless bridge/client
of some sort that should do the trick fine. The open source Linksys
WRT54GL also has some interesting possibilities in this regard with
some of the firmware hacks getting around.
These wireless client devices will connect to just about any Wireless
Router so it shouldn't matter if you need to mix the brands up. I set
up a Linksys WET11 for a customer who already had a Netcomm NB3000 Wireless
Router and the results were rather spectacular. Pings and throughput were
fantastic with no noticeable difference from a cabled connection.
1.12 Why do some Routers
have different version numbers?
Sometimes a manufacturer will change some internal parts that will then
require that different firmware version must be used.
The version number of the product indicates to the owner which firmware
version they need to use with their product.*
Sometimes these new hardware versions are released because of a short
supply of a part, or because an alternate part can be manufactured much
cheaper, and sometimes a new version will represent some improvements
over the original. It's often difficult to find out which is which and
quite often an older version will come back onto the market (eg if a supply
problem with the original part has been fixed). In most cases it doesn't
matter a great deal which version number you end up with as they all have
pretty much the same performance and features but there are exceptions
to this so it pays to do some googling to find out as much as you can
about a product to see if there are any known problems with any particular
*Warning: Uploading the wrong firmware version to your Router
usually won't work but in some cases it will accept it and cause the product
2.0 Using Routers
2.1 How do I configure my PCs with a Router?
2.2 Can I still Network my PCs if I have a Router?
2.3 How do I configure the Router?
2.4 What is Firmware?
2.5 What is NAT?
2.6 What is NAT-T?
2.7 What is SPI?
2.8 What is Content Filtering?
2.9 What is UPnP?
2.10 What is VPN/multiple VPN Pass-through?
2.11 What is Port Forwarding?
2.12 What is DDNS?
2.13 What are logs?
2.14 What is Idle Timeout?
2.15 Watch out for the Power Button
2.16 What is Bandwidth Aggregation?
2.1 How do I configure my PCs with a Router?
In most circumstances, the default (DHCP) settings will do the trick.
The PC's TCP/IP settings should be on all automatic and the Router will
take care of the rest. See the Client PC setups on any of the guides.
eg Windows 98/ME, Windows
2000, Windows XP.
Some Routers like Snapgears have their DHCP function disabled by default,
so you'll need to configure your PC with the applicable Static IP or use
the "Router Find" utility that comes with it.
Routers use the TCP/IP protocol for Internet Sharing which is universally
supported by all types of Operating Systems including Macs, Linux, Unix
and anything else around, so you don't need a Windows PC to use a Router.
Routers are very popular with Macintosh users as they're usually a much
cheaper and easier solution than most of the software applications available
for Internet Sharing.
If you prefer to use Static IPs on your Network, all you need to do
is find out the Router's IP address to use as a starting point. For example,
if the Router has an IP address of 192.168.1.1, you would give your PCs
IP addresses in the range of 192.168.1.2 to 192.168.1.254. (Be careful
not to give any two PCs the same number, or to give a PC the same number
as the Router or any other device like a Print Server).
Subnet can be the standard 255.255.255.0
Gateway is the Router's IP address - 192.168.1.1 (in this example)
For DNS Servers, if your Router has a DNS Forwarder you can use the Router's
IP address as your Primary DNS Server, otherwise specify your ISP's DNS
If your ISP uses unqualified Domain Names (eg if the name of their mail
server is something like "mail", "pop" or "mail-hub"
and not something that mentions the ISP's name in full like "mail-hub.bigpond.net.au"),
then you will need to find out their DNS Suffix and also specify that
in your DNS settings.
These TCP/IP settings are the same on all OS types but they may have slightly
different names. eg Windows calls the DNS Suffix setting the "DNS
Suffix" while Macintosh calls the same setting "Search Domains"
on OSX, and simply "Domain Name" on OS9.
2.2 Can I still Network
my PCs if I have a Router?
If a Router is specified as having a number of ports (eg 4 or 8 in most
circumstances), the Router is actually two different devices, a switch
and a Router, joined together. A Router's built-in switch functions no
differently to any other switch and will not hinder networking in any
way. Actually, if anything, a Router will make networking easier as it
can tell the PCs everything they need to know to join the network and
access the Internet automatically.
As long as File & Printer Sharing, (aka NetBIOS over TCP/IP) is active
and you don't have software firewalls installed, all you need to
do is ensure that all of your PCs have the same Workgroup name specified
and then you'll be able to see them all and browse their files by double-clicking
the "My Network Places" icon. To access files on another PC,
that PC first has to "share" the folder (or printer) to allow
others to access it, and you do that by Right-Clicking on the folder or
Printer and selecting the "Sharing" option.
If you get asked for a Password (XP & 2000 mainly) when you try to
access a file on another PC, you'll need to also set up "User Accounts".
See the Broadband FAQs for a tip on doing
2.3 How do I configure
While many routers now come with setup disks*, I strongly advise avoiding
these and find out how to log into it using a Web Browser like Internet
Explorer or Firefox. The manufacturer's Quick Start Booklet will tell
you the address to type in (Usually either http://192.168.0.1, http://192.168.1.1
or http://192.168.1.254) and the default username & password you'll
need to know to login for the first time. Once in there, there'll be a
main setup section where you tell it your ISP type, username & password.
They're all fairly similar in concept and here is what it looks like on
a Linksys BEFSR41 V2
Note: It's the WAN (Wide Area Network, otherwise known as Internet)
that interests us here. All that LAN stuff is fine to leave as it is unless
there's some reason you need to change it, and then you'd only do so if
you knew why you wanted to. Actually that goes with most settings you'll
find in a Router. If you don't know what it's for, it'll be fine if you
leave it as is. The manufacturers understand that most people wouldn't
have a clue about half the stuff they put in there so they set them up
so that they'll work properly by default and leave the other options for
those that know what to do with them, or have at least read the manual.
* Setup Disks: These can be great but they're also responsible
for a great deal of confusion and compatibility issues so use the web
browser option instead if you can.
2.4 What is Firmware?
Firmware is the software inside the Router that makes it go. Much the
same in principle to what Windows is to a PC.
Manufacturers issue updates from time to time where they add features,
fix a bug or improve a security aspect. Generally it's a good idea to
run the latest version, but the old saying "if it ain't broke, don't
fix it" also applies. If something can go wrong with a Router, it'll
often be during a Firmware upgrade which in some cases may involve sending
it back to the manufacturer for repair.
Firmware upgrades can sometimes take a while and the Router can appear
to have stalled in the process, causing many people to switch the power
off and back on. This will usually have disastrous results by causing
the Firmware to become corrupted leaving a Router that no longer responds
to anything. In many cases there is a recovery process to revive them
again but this can be a fairly complex operation that will be beyond the
capabilities of many people.
2.5 What is NAT?
NAT is "Network Address Translation" and is the method Routers
use to share the Internet to multiple computers, and it also creates a
fairly effective Firewall as a side benefit.
When anything connects to the Internet, the ISP will issue a unique IP
address to it, whether it's a computer, router or whatever. IP addresses
have different classes depending on whether they're for use on the Internet
or for local internal Network use, and public (Internet use) IP addresses
What NAT does is allow multiple computers using internal class IP addresses
to share one public IP address to access the Internet. The Firewall effect
occurs naturally because any potential hackers scanning the public IP
address can't see past it to any particular computer so they just bounce
off the Router and get frustrated. In my opinion, NAT provides a sufficient
level of security for most home users as it's effective, simple to use
and less likely to conflict with recreational applications like online
gaming and file sharing, but a Router for business use (or where there's
particularly sensitive data) should have an SPI Firewall. Most recreational
applications will also work fine with an SPI firewall, but they may require
some effort creating the right rules to get them to work properly.
2.6 What is NAT-T?
NAT Traversal. A way of getting around the NAT barrier.
See VPNs below.
2.7 What is SPI?
SPI stands for "Stateful Packet Inspection" and is a smart
Firewall that can examine each packet of data, inbound and outbound, and
automatically detect and block common forms of attack by hackers. Other
benefits are that because of the extra attention to detail that an SPI
Firewall provides, rules and filters can be far more comprehensive.
With just a NAT Firewall, a rule can be created to allow access by other
Internet users to a particular PC on your Network through a particular
port. With an SPI firewall the same rule can include limitations based
on the source of the user, the time of day and which days of the week
you want access to occur, and can also include similar rules for outbound
activity. For example, this would allow a rule to be created that will
prevent users on your Network from accessing FTP servers or even websites
during certain periods of the day.
2.8 What is Content
Content Filtering means blocking access to certain material available
on the web, and will usually log attempts by Network users to access forbidden
material. In most routers this is achieved by using either a keyword list,
URLs or both. eg You can create a rule to block access to any website
that uses the word "tree" in its name, or you can block access
specifically to "www.tree.com.au".
Some can also restrict access to Instant Messaging, Peer to Peer applications
and even block downloads depending on the file extension name (eg .exe)
or even set these so they're only available during certain times to certain
PCs on the network.
In some of the better routers, content filtering gets serious and is
available as a subscription service (with an annual fee). For example
GlobalView subscription service which is available for under
$100 for most of their products and under $50 for the 2110, 2130 &
2710 series. (Note: The filtering can usually be applied so that it
only affects certain PCs while others can bypass it).
Other more expensive Routers can also have anti-virus capability built-in
(with regular definition updates) and anti-spam.
2.9 What is UPnP?
Universal Plug and Play.
The name indicates this feature may be something to do with installing
hardware but it's actually a smart network protocol that allows ports
to be opened and closed on request. At the moment it is mainly used by
MSN Messenger to allow voice, video and file sharing to work from all
networked PCs at once without any special configuration necessary, but
in the future it'll be utilised by devices like "smart" fridges
so you'll be able to check your fridge at home from the office to see
if you need to buy milk on the way home.
I find it to be a feature that is almost unanimously demanded by home
& small office purchasers but it does have a few critics who think
it adds some risk of being exploited by a clever hacker one day and/or
MSN Messenger being use as a conduit to allow a virus into the Network.
Nevertheless, the feature can usually be disabled in the Router by anyone
who considers it a security risk.
See upnp.org for more.
2.10 What is VPN/multiple
VPN is Virtual Private Networking. This is a way for Computers in different
locations to Network to each other using the Internet instead of a direct
cable. VPNs are becoming increasingly popular with people who can't always
be physically present at a PC that they need to access regularly. eg People
who work from home or on the road that need access to a data file or email
account at the office. Another popular one is using a VPN to remote
control a PC across the Internet using an application like Timbuktu
or VNC. Doing this sort of thing via a VPN is far more secure than just
connecting directly using just a username and password.
Where VPNs can be a bit of a problem with Routers is because the Internet
is involved certain security precautions are necessary and these have
taken the form of different forms of data encryption. An unfortunate side
effect of this encryption is that it isn't particularly NAT friendly and
will usually either be blocked or restricted somehow by most Routers.
To get around this, some Routers have built-in VPN Servers and clients,
some have an ability to allow one (software) VPN tunnel to "pass-through"
the NAT barrier and others have the ability to allow "pass-through"
for several simultaneous VPN tunnels. One of the more common tales of
woe I hear from people is where they've tried to save money and have purchased
low-end Routers without considering their VPN requirements and for a few
dollars more they could have had a more suitable product.
Some comments from manufacturers on this topic:
FAE from DrayTek Engineering Department warns that while Draytek
Routers do have multiple VPN passthrough capability, not all VPNs
can pass though the NAT barrier successfully: "there are many
incompatibilities between NAT and IPsec: IPSec with AH can't passthrough
NAT. L2TP with IPSec can't be passthrough NAT device except both VPN client
and VPN server support NAT-Traversal mechanism. To the same destination,
only one outgoing IPSec with ESP connection can be established at a time
except both VPN client and VPN server support NAT-Traversal mechanism."
NETGEAR advises: "Most home router models support only
a single outbound IPSec session. Some models provide multi-session capability,
but this may not be sufficient in all situations.
The IPSec-passthrough ALG achieves its multi-session capability by using
IKE cookies to distinguish IKE/phase1 sessions and the IPSec SPI pairset
to distinguish between VPN/phase2 sessions. This differs from earlier
ALG implementations which simply returned all IPSec traffic to the NAT
client that last made an outbound VPN session.
It isn't possible to guarantee multiple simultaneous outbound sessions
in all circumstances. For example:
1. It may not be possible to support simultaneous startup and/or
re-keying of IKE sessions. This will show as multiple sessions can be
run, but not started at the same time - you may need to wait a short
time before starting the second outbound connection. And if there is
a later collision during phase 1 re-keying, one or other session may
2. A small number of IPSec VPNs initiate IKE re-keying from the server
end, rather than the more common client end. This often requires mapping
of UDP/500 to the IPSec client PC, otherwise the session will fail after
some time, often 20-40 minutes. Because the same protocol/port can only
be mapped to a single local device, this will usually preclude simultaneous
3. Some VPN client/server combos canít support multiple simultaneous
connections to the same VPN server/IP from a single NATíd public IP.
Simultaneous connections to different VPN servers may be possible, but
not to the same server.
These types of restrictions apply to the IPSec-passthrough ALGís in
most NAT routers, though it isnít uncommon to find enough difference in
the implementation detail between routers for some combination to fail
on one device, work on another but to be the opposite for a slightly different
case. Thereís no easy way to be certain, without testing the customerís
has a good discussion of why this is a complex problem to solve in the
general case, and why it canít be entirely handled in the router ALG,
changes in the VPN software are suggested as well.
Some VPN implementations support NAT Traversal (NAT-T) which attempts
to avoid the problem by re-encapsulating VPN traffic inside UDP packets
which allows them to be better handled by NAT routers. For this to be
effective, both the VPN server and client software need to support compatible
implementations of NAT-T. In some situations it may be possible to use
a VPN endpoint router in place of the software VPN client - a single tunnel
between the client-side router and the VPN server may then be able to
accommodate multiple client sessions to the same destination."
2.11 What is Port
Port forwarding, also known as Virtual Servers, is a way of directing
traffic from the Internet through the Firewall effect of NAT to a particular
PC on your Network that you want people out on the Internet to be able
to get to. Typical examples where you might want to do this include running
your own website, remote control applications like PCAnywhere, webcams
and running your own Game Server.
Data travelling across a Network (or the Internet) uses a combination
of protocols and ports, and Computers have 65535 ports (ie possible end
points or destinations). A lot of these port numbers have common uses
and are assigned by the Internet
Assigned Numbers Authority. In particular, ports 1 - 1024 are known
as common ports, and within this range you'll find most port numbers used
in day to day Internet and Network browsing. For example, Websites use
Port 80, FTP is port 21, Send email (SMTP) is port 25, NetBIOS (File and
Printer Sharing) uses port 139 and the list goes on.
What happens with NAT is when data is travelling to your PC (as
opposed to outbound), it will hit the Router on a particular port number
and will have nowhere to go. This is generally a good thing as it keeps
the hackers out, but there may be situations when you actually want that
data to find it's way through the NAT layer to a PC, and that's where
Port Forwarding comes in handy. We can tell the Router to accept that
data and direct it to the PC we want it to go to.
As an example, lets say we wanted to run a Website from one of the PCs
on a network. We know websites use Port 80 and the PC is on Internal IP
address 192.168.1.4 (See the glossary for
how to find out the IP address of a PC). So now all we have to do is tell
the Router to "route" all Port 80 traffic that comes in from
the Internet to IP address 192.168.1.4 on our Internal Network.
This is what it looks like on a Linksys BEFSR41 Router -
And this is a Billion 741GE -
Note: Port 80 is one of the standard options on the Billion. For
a non standard port there are blank options further down the page where
you can also specify a whole port range instead of just a single port
and the full range of protocol options -
With some Routers, the port number is selected from a pulldown list with
standard port numbers available. If the port you wish to use is not in
the list, you'll need to find a section in the Router where you can add
a "custom virtual server" and then it will appear. Other Routers
like the Alcatel Speed Touch Pro
also require specifying an "outside address" (the IP address
someone the Internet is connecting from). In these cases you'll
probably want this open for everyone so specifying an address of 0.0.0.0
usually does the trick.
For information about a specific application, Google
the name of the application and the words "Firewall" and "Ports"
and you'll usually turn up everything you need. Often adding the name
of your Router will find even more specific information.
A fantastic resource with specifics for dozens of Routers is PortForward.com.
2.12 What is DDNS?
Most Routers include a built-in DDNS client. See the Remote
Access page for more about DDNS.
2.13 What are logs?
Most Routers keep logs of all kinds of activity both inbound and outbound.
Some, like most Netgears, can be configured to email the logs to you at
specific intervals or when certain types of activity occur. Other Routers
like Linksys and Netcomms have an external application (downloadable from
the manufacturer) that collects the log data from the Router and displays
it in various ways. (For these types of Routers there will be a page where
you can turn logging on and specify the IP address of the PC running the
logging application). Other people have written their own versions of
these logging applications that can display the data in lovely graphs
Netgear, Linksys & Zyxel.
SNMP utility for Billion 741GE.
D-Link DSL500/504 info dump
And there's probably heaps more of these around too for other products.
2.14 What is Idle Timeout?
Some Routers' Internet connection types like BigPond Cable
have an idle timeout setting. This is supposed to instruct the Router
to disconnect from the Internet if no one has used it after a certain
amount of time and then reconnect automatically as soon as someone tries
to access something again. Personally I can't see the point and this feature
has caused so many problems for so many people I'd prefer to see it omitted
completely in favour of an "always on" connection. After all,
we're not charged by time on Broadband so what's it for?
Furthermore, this feature can cause some truly evil behaviour on some
Routers. With Netgears for example, we used to be instructed to set the
idle timeout to "0" for an "always on" connection,
but now with many models, setting this to "0" causes the Router
to constantly connect and disconnect in under a second. (Aargh!). Even
worse is that these same models still instruct to set Idle Timout to "0"
for an always on connection in the help files.
Linksys are worse again (Termed "Keep Alive: Redial Period xxx seconds"
or similar). Setting this field to 0" will often cause the Router
to go into a perpetual reboot sequence which is not recoverable or
reversible so it has to go back to the factory under warranty.
Your best option with Idle Timout is to set it to 30 mins regardless of
what the manufacturer's instructions say.
2.15 Watch out for
the Power Button
A quick warning on Power Buttons.
Power buttons are quite often a weak link on this type of equipment and
are one of the key areas of failure second to firmware corruption. In
most cases you're better off not touching them, but if you do feel the
need to switch your Router off on a regular basis it's best to switch
it off at the power point or even pulling the power out of the back.
Most manufacturers have omitted power buttons from modern models because
of this problem. Hey, warranty claims cost money that has to be factored
into the production cost, so if you can eliminate 20% or more of them
by leaving out a dodgy 15 cent switch, it makes perfect sense.
2.16 What is bandwidth
Some routers have ports to allow them to be connected to
more than one modem. These products are often termed multi-WAN
routers and when they can be connected to more than one ISP simultaneously
you have an aggregated connection. But there's a catch: You cannot
combine multiple broadband connections to create one super-fast connection
as such. What you can do is "load share" or "failover".
Failover means if one Internet connection goes down
it will automatically switch to the other.
Load share means it distributes the available bandwidth
evenly between the connected users depending on demand. For example, with
all things being equal such as 10 users on a LAN
connecting to multiple servers all capable of delivering full download
speed and you have 2 x 1500 kbps Internet connections, each user will
get 300 kbps download speed. In other words, each user gets much
faster downloads than they otherwise would have with just 1 x 1500 kbps
connection. However, the fastest any one user will achieve with still
be 1500 kbps. You cannot combine 2 x 1500 kbps broadband connections to
create one 3000 kbps connection as many people expect. Now, with dial-up
and ISDN you can combine multiple modems to form one faster connection
using Windows Multilink
(or various open source solutions) and an ISP account that supports it
but as far as I'm aware there's no such option with Cable,
ADSL or 3G, at least not in
* Update (June 2010): Zyxel have released the P-663H-51
ADSL 2+ Bonded Router which does do ADSL2+ port bonding. However,
you still need an ISP that supports it, and iinet
has just started offering a bonded DSL service in Australia.
An easy way to find multi-WAN routers is to use the Find-A-Router
section where there is an option to select routers with more than one
ethernet WAN port. However, there are also
other variations in multi-WAN routers. Instead of two ethernet WAN ports
you might find products with a built-in ADSL modem and an Ethernet WAN
port and/or a USB port for a 3G modem and so on, so you'll need to select
different options to find these such as ADSL modem + Ethernet WAN port,
or ADSL modem + 3G USB port, or Ethernet WAN port + 3G USB port, and so
the cheaper stuff: While most multi-WAN routers have failover or loadshare
capability, some will only have failover and some will not do either and
can only be connected to one ISP at a time. Usually the cheaper the product,
the less likely it is to have loadshare and/or failover, or the less creative
you will be able to get with how the bandwidth is allocated so read the
fine print or talk to the manufacturer or seller when in doubt.
3.1 I can't connect to the Router. It just says "Page
cannot be displayed".
3.2 I can't send emails. What am I doing wrong?
3.3 I can't connect to BigPond or Optus Cable.
3.4 I can't connect to ADSL.
3.5 Router is unresponsive.
3.6 I've got a modem/router combo but I want to plug
it into another Router.
3.7 My Router keeps locking up or dropping out.
3.8 My ADSL modem has a poor sync
3.1 I can't connect to the Router. It just says "Page
cannot be displayed".
There are three main reasons for this -
1. The PC is not getting an IP address from the Router. This can be because
the PC is configured with a static IP address in an incorrect range, the
Router's DHCP server is not switched on (Usually a reset via the reset
button will fix this but some Routers like Snapgears have DHCP off by
default), or the PC has not had a chance to renew it's IP address. See
the glossary for how to force this
2. There is a Proxy Server specified in your Internet Options.
Go to Control Panel > Internet Options > Connections and set to ď never
Go to Control Panel > Internet Options > Connections > LAN Settings
and untick all the boxes.
3. There is a faulty or incorrect cable type being used. Check that link
lights on the router are coming on to indicate a valid connection between
your PC and the Router.
3.2 I can't send emails.
What am I doing wrong?
Many ISPs use "unqualified domain names". This will usually
be the case if the outgoing (SMTP) mail server in your Email account settings
doesn't have the ISP's name in it somewhere. For example, BigPond Broadband
uses "mail-hub" while the fully qualified domain name is "mail-hub.bigpond.net.au".
To get around it, you will either have to add the rest of the domain name
or add a special DNS suffix to the TCP/IP settings on your PC.
See the Broadband FAQs for more help with
3.3 I can't connect
to BigPond or Optus Cable.
See "Connecting Routers to Cable ISPs" here.
3.4 I can't connect
The most common reason for this is when your ISP uses a PPPoE or PPPoA
connection type (most ISPs that support one also support the other so
it doesn't matter which you choose) and you don't add the full username.
In almost all cases, the user name will be "username@something"
and not just "username". eg BigPond customers use username@BigPond,
Iinet customers use firstname.lastname@example.org and Internode customers use
email@example.com. Notice that the last bit varies between ISPs.
Some, like BigPond, just require @bigpond and nothing else or it won't
work, whilst Iinet needs the .net.au bit as well.
Update: I recently hooked up a BigPond customer and only "username"
by itself would work. The usual "username@bigpond" format just
plain refused to connect, so if you're having trouble connecting you should
definitely try a few variations along these lines.
Optus ADSL is a little peculiar and deserves a special mention
too. Most ADSL modems have a setting in the advanced section for the "Authentication
Protocol" to be used. By default this will usually be set to something
like "PAP/Chap" or "Chap (Auto)" but these don't work
with Optus DSL. It must be changed to PAP only.
Another common reason when using ADSL modems like the Billion 711CE/7100Pro
or Netcomm NB1300 is that these require a crossover cable to connect to
a PC or another Router. You'll spot this right away as the link lights
won't be lighting up if you've got the wrong cable type.
For other ADSL types that use variations of IPoA (like TPG), if you're
not sure which encapsulation type to use, just try every option that doesn't
require a username and password and check the Router's status page with
each attempt until you get it.
Another one that frequently comes up is where there is a fault on the
ADSL line or the exchange. These ones will be obvious in that the Line
Sync light will not be showing a "sync" status. Generally a
proper line sync will be shown by a solid glowing sync light on the modem,
but some oddball modems may show a line sync as a blinking light. For
example, some firmware versions of Dynalink RTA100 & 220 show a blinking
light, but to add a spanner in the works, these same products when upgraded
to more recent firmwares will show a solid light.
In my experience connecting ADSL whilst working for Telstra, when line
sync problems came up, the rate of faults in the line or exchange Vs actual
faulty modems was around 100 to 1, so the chances of having a faulty modem
in these circumstances is fairly small (particularly if you can log into
it and everything else seems to be functioning properly). However, it
still happens, so if the ISP is going to charge you a service call to
inspect the line where no fault is found, the only way you can double
check your modem is by plugging it in at a location where the ADSL is
known to be working, or borrowing a proven modem and plugging it into
your phone line.
3.5 Router is unresponsive.
If your router is completely locked up (sometimes called "bricked"
because it's now only useful as a doorstop) all may not be lost. This
is quite often a case of software corruption rather than a hardware problem
and some products can be fixed without sending it back to the manufacturer.
The first thing to try with any product is to stick a paperclip into
the reset hole on the back until you feel the tiny button and then hold
it down for 10-20 seconds or until you see a flicker or some other response
in the lights on the front. Give it a few seconds and then power it off
and back on.
Tip: If the reset button doesn't appear to be working, one trick
that sometimes works is to hold the reset button down while powering the
router off and on a few times in quick succession.
If a reset doesn't fix it, some manufacturers have recovery tools available
for this situation:
- Billion have a recovery tool available for most models in the
download section on their website. (Be sure to read the instructions
carefully because it usually involves 2 cables plugged into the right
places for it to run. It's an exe too so if you're a Mac user you'll
need to get hold of a Windows PC with a serial port).
- For Draytek owners see Method 4 "Force Vigor Router into TFTP
mode then do the firmware upgrade" here.
If you're a Mac or Unix user click
here for instructions using command line and TFTP.
- For other manufacturers try googling
your router name and the word "bricked".
If you luck out, it's back to the manufacturer for warranty.
3.6 I've got a modem/router
combo but I want to plug it into another Router.
Many modem/router products like the Netgear DM602,
Billion 5100 & 7100Pro, Dynalink RTA100 and others are commonly purchased
to be used with other Routers and also many people may have existing modem/routers
that they want to use with different Routers (eg Wireless Routers). What
we need to do here to get the best results is to change these products
to behave as standard modems (called "bridging") and not behave
as Routers any more. The reason for this is that having two Routers inline
isn't a good thing to do and while usually you'll get things working this
way, it becomes very difficult to configure other services through and
you could also create a bottleneck in the data flow. (Something you particularly
want to avoid if you're plugging a basic modem into an advanced multi-VPN
Router for example, as you'll lose all the advantages the better Router
has to offer).
The first step is plug the modem directly into a
PC. (If you plug it into the Router you're going to be using you won't
be able to access it to change the settings).
Next, follow the manufacturer's instructions to set up your PC to log
into the modem's configuration menus.
Look for an option in the menus (Usually under "setup" or "quickstart")
where you can change it into a "bridge". Depending on the product,
you may also have to adjust the encapsulation type to match. eg. It may
have an option that says "Bridged IP LLC" or "RFC1483 Bridge"
and other similar derivations.
Other details like usernames and passwords leave blank, and uncheck any
options to "dial on demand" or "automatically reconnect".
Save the settings and Bob's your Uncle. You can now plug the modem into
the Router and set the Router up to login into ADSL using a PPPoE ISP
Bridging instructions are usually found within the
modem's manual, but these links may help.
Alcatel Speed Touch Pro
Alcatel Speed Touch 530/510
711CE/7100Pro (Scroll down to the first Technical FAQ about half way
down the page)
Netcomm NB1300 is very similar to configure to the Billion above
Netgear DM602. See "Configuring the modem in modem device
mode for a fixed (static) TCP/IP account" on P38 of the downloadable
Manual from Netgear.
Note: Most ISPs are LLC based and use VPI
of 8 & VCI of 35, but check with your ISP if unsure of these parameters.
Note2: Some people worry about the old modem/router being on a
different IP range or even being on the same IP address as the new Router.
The IP address used by the modem/router in bridging mode doesn't make
a lick of difference and won't conflict, so there's nothing to be considered
there. In bridging mode, the modem doesn't have an active network presence
so it's invisible to everything on the LAN anyway.
Note3: If your old modem/router has 4 ports, Internet Sharing will
no longer be available from these extra ports once it's in bridging mode.
Your PCs will need to be plugged into the new Router for this to happen.
Another way to do it is allow the modem to
perform the authentication but switch off NAT (sometimes called "half
bridge"). Then set the Router up as a Connection that doesn't require
a username & password (Dynamic ISP). This technique comes in handy
if your ISP uses a PPPoA authentication type but your Router only does
PPPoE and it won't work (often it will work anyway, so give it a try first).
Note: If you're bridging a router/modem to
another Router and can't seem to connect, plugging the modem directly
into a PC and configuring a software connection method can reveal some
useful error messages (if it won't connect that way either of course.
If it does, you know something's amiss with the Router configuration).
"Authentication error", or "username/password is invalid
on the domain" type messages are incorrect username and/or password
problems. (Be aware that sometimes these happen because the ISP hasn't
properly activated your account or they've given you incorrect details
or a typo)
"The remote computer did not respond" indicates the modem is
not bridged correctly or a line or exchange fault exists. Sometimes phones
and other devices plugged into the same line without filters can cause
interference to the modem too.
My Router keeps locking up or dropping out.
There could be several reasons for this.
1) Viruses & Malware.
A surprisingly common reason is infection by certain viruses. See my
blog entry referring to Welchia virus. Another common one a few years
back was SDBot
but there's plenty that can cause this problem. These viruses will flood
a router with so much traffic that it will cause the router to lock up
or reboot giving the false impression that there's something wrong with
the router. Netgear
released a news bulletin about it when the first of these started
to pop up.
Don't always trust your anti-virus software either. I have seen first
hand on several occasions Welchia or SDBot have been rampant on PCs running
up to date versions of common anti-virus products, and I have even seen
SDBot infect a PC within minutes of going online after a format and clean
installation. The best way to check is to install a network analyser like
trial version and check for large amounts of unusual outbound activity.
2) Outdated or Corrupt Firmware
Versions. Instability can be a problem on many Routers with some of
their initial firmware releases. Upgrade your Router to the latest Firmware
available and see how it goes. Corrupt firmware may also sometimes be
less than obvious. If your router used to behave fine but recently started
playing up then download and install (or reinstall) the latest firmware,
perform a factory reset then reconfigure from scratch. (Don't use a backup
configuration file in this case. Always manually configure it)
Processing Power. Your
Router may not have the processing power for what you're asking from it.
Routers below say $150.00 are designed for basic home networks of 5 -
10 users as a rule and the cheaper the product the less likely it'll be
able to perform well under busy loads. For larger Networks, or where there
are busy servers present, throughput figures become very important and
more expensive products become the cheaper solution in the long run. (Big
dollar products usually means lots of processing power.)
4) Torrents. Related to
point 3 above is using file sharing applications like BitTorrent.
Most torrent clients by default don't restrict the number of current open
connections and this can quite easily fill up a Router's NAT table within
a short period of time and cause poor performance or frequent lockups
or reboots. If you're into these things make sure you do your homework
first by searching the BitTorrent forums to find which Routers cope the
best. Alternatively I believe some clients have an option to restrict
the number of active connections in their advanced options and this will
generally cure the problem too as far as I'm aware.
5a) Cable Internet. If you're
on Cable Internet, check that it is correctly configured and that you
have the correct type of Cable modem to plug into a router per the "Connecting
Routers to Cable ISPs" FAQ.
5b) 3G or 4G Wireless Broadband.
If you're on 3G or 4G Internet click here.
6) ADSL Filters. ADSL modems often drop out
due to problems with the phone line or inadequate filtering allowing interference
from other devices such as a Foxtel IQ box. See ADSL
FAQ 1.6 for more about line filters.
7) ADSL Line Quality. Your modem's ADSL status
page can tell you quite a bit about your line quality. Phoneworks
have an excellent breakdown of what's good and what's bad when looking
at these figures:
|20bB. and below
||Poor and may experience connectivity issues
|60dB and above
||Bad and will experience connectivity issues
SNR (Signal to Noise Ratio)
|6bB. or below
||Bad and will experience no line synchronisation or
intermittent synchronisation problems.
||Fair but does not leave much room for variances in
||Good with little or no synchronisation problems
|29dB. Or above
Here is where these figures can be found on a Draytek modem -
On Billion modems these are usually found in the web interface under
Advanced > Status > ADSL Status.
Other manufacturers follow a similar pattern and will be under a "status"
: SNR may be referred to as "Noise" or similar
on some products, and where figures for both upstream and downstream
are displayed all figures need to be taken into account.
See the Phoneworks
ADSL Troubleshooting page for more information on these figures.
If you have a poor SNR figure (6 or less) the first thing to check is
if the fault is on your premises. To find that out perform a
Line Isolation Test. If that makes no difference it's most likely
a fault on your telephone line in between your premises and the Telephone
Exchange so consult your ISP*.
* ISPs are notoriously reluctant to organise a technician to check the
line because it costs them money whether a fault is found or not so it
may often take some negotiating to get the problem fixed. They may also
recommend a change of profile (ie sacrifice some performance for stability)
which is often an acceptable workaround.
Tip: If you're still unsure whether a fault lies with your modem
or with the ISP or the phone line, the only way to be sure is to try another
modem or try your modem at another location that is known to be fine.
8) Faulty UPS or Power Board. A fairly rare
one but one that does come up occasionally is problems with uninterruptible
power supplies (UPS) and/or surge protectors. If your router is plugged
into one of these and you're having lock up or rebooting issues, try bypassing
the UPS or surge protector to test if it's the culprit.
My ADSL modem has a poor sync rate
There is some variation with how various modems report their sync rates
so it isn't always a reliable figure to judge a modem's performance by.
A better test, if you have one modem reporting a faster sync rate than
another, is to perform a download test from
a known good download source.
Also, some modems may prove to handle poor line conditions better than
others. For example, modems with Broadcom chipsets are known to be more
stable under poor conditions while other chipsets are more performance
orientated and may drop out from time to time under the same line conditions.
However, this is not necessarily the modem's fault and even if you do
find one modem more stable than another you're probably still losing performance
so it pays to check your line conditions (see point 7 in the FAQ above)
and talk to your ISP as necessary to address the problem.