I stumbled accross a Sagem F@ST 2404 ADSL modem recently. While I was experimenting with some of its features, I found an interesting feature (or a bug :P) in version 3.21a4
Usually, many home ADSL modems provide command line access (usually via telnet) along with their fancy Web interface.
If you try to connect via telnet to ths ADSL modem, you will be provided with the follwing screen of options:
The busybox shell is spawned! Great!
You can explore you router internals via typical
cat commands. You can also view running processes using
Be careful not to run the
cfm executable! I speculate that this is the router's bootstrap script and if you try to re-execute, you will probably lose connectivity. In that case just try a hardware reboot of the router.