General Questions

Hello there...
I was an ipcop user but 3 days ago I have installed mono on my Pentium III 500
I have 3 ethernet cards 2 are configured and one is not configured
The firstone goes to the dsl modem and i connect it to the internet with PPoE
the secondone is used for the lan and the ip is 192.168.1.1.
At the firs time the sistem works grate for 2 days but yesterday night it starts to make a BIP fromthe buzer and the LAN doesent work a few minuts later it restarts to work i go in to the configuration page i get a look in the interface setting andit evrything ok a few minutes later adsl doesent work i go into the configuration and ppoe interface is down...
i reconnect and 5 minutes later the lan is blocked with the BIP of the computer...

Whats is wrong in my mono??

Sorry for my bad english