I read about TCP/IP Illustrated, Volume 1: The Protocols (2nd Edition) 5.4.3.1 Direct Delivery, this chapter illustrate the direct delivery like below: But what confuse me is the forwarding table of S: As you can see, in the second entry of the forwarding table of S, the Next hop address and Interface address are the same, I don't think this will make any sense because I think 10.0.0.100 is the IP address of S, so the Interface address of these two entries should be 10.0.0.100, but the Next hop address of the second entry should be the IP address of D, not 10.0.0.100, just like the first entry, 10.0.0.1 is the IP address of R, am I right? if not, please correct me.
1 Answer
When the gateway address for a route points to one of the host's interfaces it means "I'm the gateway, I'm able to transmit to this destination directly."