Jeff Ogden wrote:
is causing network problems due to heavy ARP loads when the local site routers ARP for what turn out to be unused IP addresses. This is an issue when there are large blocks of IP addresses behind a router. It is less of a problem when there is a relatively small number of IP addresses behind a router (say one class C worth). Are others seeing these sorts of problems? What strategies are there for dealing with this?
If addresses are contiguous, perhaps you could blackhole some of them temporarily. It might be nice if there was a way to take a current ARP table and freeze it. That is, mark all the entries as permanent, then turn off ARP or dump destination IPs not in the ARP table into the bit bucket. As long as the router continues to respond to ARP requests, this might be a short term fix for that type of event. John