I was contacted by a friend with the following problem.
He was logged on a 3550-24 layer 2, with no default-gateway on it.
the funny thing was that he was logged on it from a remote subnet not even close to the one configured in this switch.
He was able to get to the router using PROXY ARP, which we confirmed on the ARP table.
the switch was on a 10.0.0.0/24 network and the remote machine on a 220.127.116.11 network.
we could see this subnet on the ARP table with the MAC of the router doing PROXY-ARP.
My question is...I thought that the switch would only send ARP requests for his local network.
its IP is 10.0.0.7/24. So, how did he sent an ARP request for the IP address 18.104.22.168.
Did I read this wrong?
Please let me know.