![]() Though bypassing the ND/ARP step is possible, it is not directly supported by much software. ![]() The mapping from IP address to MAC address can change, for example if you have redundant gateways. It may seem redundant, but remember that every time a layer of indirection is introduced, it means there is something which can be changed (more or less dynamically) for added flexibility. In that case the gateway IP address would only be used for ND or ARP. So using the IP address for that could be avoided if you really wanted to. ![]() There are other ways to specify which network interface a routing table entry is used for. And after that the gateway IP address is used for ND or ARP to learn the MAC address of the destination. When a routing table entry is created the gateway IP address is used to decide which network interface the packets have to be send on. ![]()
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