Upgrade to 2.4.17 Problem

[Ed Lawson]

I just upgrade the kerenl on my woody box from 2.2.19 to 2.4.17-k6. 
Everything went smoothly and it rebooted into the 2.4 kernel without 
problems. However, I've lost network connectivity.  The NIC is 
recognized, it is there under ifconfig, I can ping the assigned address, 
but I canot ping any other machine of the network nor access the 
Internet (obviously).  Perhaps I need to reconfigure something?  What 
might be the cause and where should I look?  TIA

Ed Lawson