These notes are based on my observations with an M11, but I assume the others are similar.

There are lots of these modem/routers around, as TelecomNZ used to rent them out when ADSL was first available here.

They support pinholing.

Useful tips:

• they run a telnet server, and optionally a HTTP server, for configuration
• The password is "Telecom". Username can be anything.
• useful console commands: status show help (all commands for displaying info) configure (to change settings)
• Put telnet on port 1, HTTP on port 2, and forward all the other ports to your Linux machine.
• The nokia / Telecom logo on the front is actually on a panel that you can open to find a serial port. However, it is an RJ-45 so you will need to find an appropriate cable.