network problems after upgrade

[Kendra Renee Gehlbach]

Hello,

I recently updated a FreeBSD system that has been running fine on 6.2 to 
7.0.  I rebuilt world & kernel, installed world & kernel, mergemastered, 
then rebooted.  Now both network cards (em0, an Intel Pro/1000 v6.7.3, 
and rl0, an SMC eznet-10/100) are giving continual watchdog timeouts.  
Ifconfig shows them as active, with appropriate settings.  There are no 
IRQ conflicts that I can see.  Pinging loopback and the ip address of 
each card succeeds, but we can't ping anything outside of the system.

We've tried disabling ipf; we've taken out each card in turn, trying it 
with only one card; we've tried building the generic kernel, just in 
case we accidentally took out something necessary; we've taken rc.conf 
down to just defining the gateway and addresses for the network 
interfaces; at this point I don't know what to try next.  I can restore 
from backup to cvsup and get any current changes, then rebuild, but I 
hate going through all of that without any reason to believe anything 
will change.

Any ideas for further troubleshooting would be very welcome!
Renee

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