We have a L2 switch in a remote location; it is connected to HQ by a metro-ethernet. We replaced a server on Fa0/5, keeping the same IP address. We could not PING the new device, from either direction. I was unable to find the ARP entry in the L2 switch, but I did clear it in the HQ router (which was attached to the metro-ethernet). Once I did that, every thing worked fine. My question is: why did I have to manually clear the ARP entry? Why didn't the PING from either direction force-clear it? I know I've replaced servers in the past, without having to manually clear ARP. Did the metro-ethernet complicate things?