Hi All, Got a question about Routers and how they use ARP / Mac Addresses Now I know that a router will use ARP to send data link frames onto a specific host if it's on it's network and use it's ARP table to look it up (or do an ARP broadcast if it doesn't know it) What I'd like to know is how does the process work when it's router to router, i.e traversing the Internet over multiple hops to get where it needs to be. Im guessing it can't work purely on MAC Addresses because then there would be no need for layer3 (IP) addressing whatsoever. Does a router forward onto the next logical hop (another router) by IP only? If it does this, I don't understand how the data would ever physically reach the network card. Hope someone understands what I'm trying to ask!!!