> If you copy the remote MAC address from the incoming packet into the ARP
> table, instead of just assuming that the existing ARP table entry was
> valid, then you avoid that problem. 

That would break asymmetric routing...
After all the ARP table is filled with a MAC address contained within
the ARP packet, not the address the ARP packet came from.

	David

-- 
David Laight: david@l8s.co.uk