Proxy ARP and local proxy ARP behavior

When local proxy ARP is enabled, all valid ARP requests receive a response.

When proxy ARP is enabled, all valid ARP requests receive a response if the following conditions are met:

  • There is a route to the target IP address in the ARP request (this can be a route or default route), and the VLAN (interface) the ARP request is received on does NOT match the interface for the next hop in the matched route to get to the target IP address.

AND

  • There is a route back to the source IP address in the ARP request and the interface the ARP request came in on DOES match the interface for the nex thop in the matched route to get to the source IP address.