first of all...besides the problemlinuxbox i have several windows boxes which all can access internet and each other via my router. so there should be everything allright.

Now on to my problem^^

I installed knoppix 5.1.1 on one of my boxes harddisks, did a dist upgrade(over internet) and shutdown the box yesterday. Today i started the box and it took on some very strange behavior.
from the linuxbox i cannot initiate any connection to the outside network or internet...even ping says i should use -b option if i want to broadcast, but from network control or ifconfig everything looks like it should be, as far as i know. the only exception is, that i can use samba to connect to my windowsboxes.
From these windowsboxes i also can ping the linuxbox, use http to connect to apache, connect to smb, connect using ftp.

I hope someone has a hint for me, where to look for a solution of this.

thx
Dirk