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A known problem with the Alcatel SpeedTouch modem
is the lack of an webinterface, enabling the user or administrator
to map particular IP-ports to a specific server (or PC). Much cheaper
hardware, like D-Link, SMC, etc., have this feature,... makes you
wonder why Alcatel doesn't.
The ability to map a port is very important if
you are running a, let's say, webserver in your local network which
you would like to have available on the Internet as well.
The explanation shown below is usefull for most
Alactel user, but more particular for user of a hacked
Alcatel modem or any Pro model.
Tip: Maarten has created
a really helpfull tool for this, visit his his
website to monitor updates and subscribe yourself to his newsletter!
Take a look at the tutorial I wrote on How
to use the AutoPortMapping tool.
Tip: (thanks to Mathieu)
failing to create a port mapping (“Failed to create static
link”) can be caused by: either the port is already mapped
(the list command can confirm this) or you will need to upgrade
Tip: (thanks to "FireBlack")
many games have an option-menu and/or a preference menu where you
can either find or set the port to use. It's also a good idea to
visit the website of the maker of the game, in order to find out
what ports are used..
Why should I map ports?
Do I need it?
The firewall, but most of all due to NAT (Network Address
Translation), no-one from the Internet will be able to see what's going
on on your local network.
This can be a pretty good thing, if you don't want hackers
to screw with your hardware. It can be a pain too, when you want for example
a web (HTTP) of FTP server that must be available for folks on the Internet.
For a server to be visible on the Internet, you will
need to tell the Alcatel that request from the Internet should be redirected
to your server (a particular internal IP-address).
Like I said before: unfortunally, Alcatel forgot to
include such an interface.
After reading this, you might wonder: do I need this?
It depends, here you find some examples where you might
need to map a particular port:
- FTP-server (port 20 and 21)
- Web (HTTP) server (port 80)
- MSN messenger (ports 6891 - 6901)
- Postbank Online
- Hosting games (for example, Quake uses port 26000)
I collected some data drom to Internet and create a
huge list of commonly used IP-ports. If you're
missing an IP-port, mail
me that port or application so I can add it to the list!
Mapping ports using a Telnet-session
Depending on the server you would like to use, ie. the
application you want to be available on the Internet, you will need an
Once more, take a look ath IP-ports
list I made.
Now let's assume you want a webserver available, which
uses HTTP, commonly using port 80. You can use, for example, IIS or PWS
that is available for most Windows versions.
Now we need the modem to re-route packets that arrive
on that particular port to our server, let's assume the server is the
PC with IP-address 10.0.0.150, and out modem has the IP-address 10.0.0.138.
Mapping a port
1) Start a Telnet session to the modem.
- Choose"Start" -"Run"
- Type: "telnet 10.0.0.138"
(always without the double quotes)
2) Login into the modem
- Press enter and enter the
username "User" (unless you changed username and/or
3) Go to NAT and set a port
- Type "nat" and press ENTER,
The NAT-prompt appears: "[nat]=>"
- Type "create"
and press ENTER.
- The first question appears: "protocol =",
type "tcp" and press ENTER.
- The next question appears: "inside_addr =",
now enter the IP-address of your server (10.0.0.150) and press.
- The next question appears: "[inside_port]
=", type "80" and press ENTER.
- The next question appears: "outside_addr
=", type "0.0.0.0" and press ENTER.
- The final question appears: "[outside_port]
=", type "80" and press ENTER, you're now
back to the "[nat]=>" prompt.
You can enter this all by typing one single line:
"create protocol=tcp inside_addr=10.0.0.150:80
(without the double quotes)
and press ENTER.
Needless to say that the previous method is easier.
To save the settings into your
modem (so they stay there even after shutting down the modem), you must
use the "save" (still in
the telnet session) command.
When done, you can close the
You can map all the ports you
like to a specific PC.
Removing a port
Ports kan be removed, by using
the exact same sequence as when you create a port-mapping. However, instead
of the "create" command in step 3, you must use then
"delete" command .
Overview mapped ports
You can get a list of all mapped
ports by using the "list" command.
Everything on one server
You can also map ALL ports to one particular server,
by using the command "defserver".
To do this, once more open a
When getting to step 3, type once more the "nat" command
followed by an ENTER.
Now you can type "defserver addr=10.0.0.150" and press
Here you will need to save the settings as well by using the "save"
If you would like to see what
the default server is, type "defserver" and press ENTER.
You might now see "Default server is 10.0.0.150".
You can disable the default server
by typing "defserver addr=0". When typing "defserver"
you will see: "Default server is undefined".
Note: DEFSERVER will ALWAYS
be overruled by mapped ports! (thanks Bas for the tip!)