![]() ![]() ![]() Others tell me in comments it's still current, but personally I haven't seen used in anger for over 20 years. There is a technique which is like what you are thinking of, called "proxy ARP". Hosts with many routes decide which gateway is next-hop depending on target IP address. Hosts with many interfaces do the "is-it-local" test for each interface. ("Uses ARP" = look in cache, if not found, make ARP request, wait for ARP response.) If local, then it uses ARP to resolve the MAC address, if remote it uses ARP to resolve the MAC address of the default gateway. The usual case for hosts is much simpler: it uses its own IP address and network mask to decide if the target IP address is local or not. Does ARP work this way in this case: 1-Host broadcasts an external IP address to the subnet asking who this is, 2- gateway router responds with its MAC, 3- For another external IP the process repeats again and again. ![]()
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