After the time-out period on the host, the proxy ARP MAC address ages out of the ARP
cache. The host can then make a new ARP request for the destination and get the address of
another proxy ARP router. Still, keep in mind that the host cannot send packets off of its subnet
during the failover time. This isn’t exactly a perfect situation, so there has to be a better
way, right? Well, there is, and that’s precisely where redundancy protocols come to the rescue!