[NTLUG:Discuss] Dual Nic's

[Merlin]

Chris J Albertson amused Merlin with these comments:
> You will want to have one card up, and the other down. You'll then need
> a process that watches the "up" cards ability to communicate to "the
> world." (Apply your definition accordingly) This could be as simple as
> pinging the router from time to time.
> If communication fails, you down the "up" card and bring up the down
> card. There is an issue with arp that you'll need to look into, but I
> can't remember that off he top of my head.

I think the issue with ARP that you are thinking about has to do with the
ARP cache for static IPs and MAC addresses.

We have time clocks that are network enabled.  We will occassionally have
to swap out a clock due to hardware failure.  When we do, we have to flush
the arp cache to clear the IP/MAC address associations.  Once we do, then
the IP address routes past the router just fine.

-- 
Merlin
"Do not meddle in the affairs of Wizards,
for they are subtle and quick to anger."