Neostrada ADSL + Linux + Siemens SpeedStream 4100 modem

If you have a Neostrada ADSL connection and a Siemens SpeedStream 4100 modem, it is really easy to configure it on Linux. You only have to:

1. edit the /etc/network/interfaces file and configure the card connected to the modem (you need to set the IP address, the gateway, the netmask and the broadcast address - your provider should give you all this data)
2. execute /etc/init.d/networking restart

I am by no means a network guru and I cannot exactly explain why it has to be done like this, but my guess is that the modem handles all the PPPoE stuff, so no PPPoE client (like RP-PPPoE) is necessary.