[Techtalk] eth0 appears to be configured correctly but can't ping across network

[Jeff Dike]

> I can ping the card and the machine name from itself but I can't ping my 
> gateway (ISDN router) or any other machines on the network and I can't ping 
> this box from any other machine.

Try running tcpdump on that interface, then ping something.  On a working
interface, you'll see an arp request go out, an arp reqply come back, then
pairs of ICMP echo request/ICMP echo reply.

				Jeff