On Wed, 24 Nov 2004, Lawrence MacIntyre wrote:
It's a routing optimization for the network. Even if your dual-homed machine isn't a router, it's still on both segments. The alternative is that the net has to route your packet to the other segment. It's clearly more efficient to have the machine answer directly.
Except that there will never be a ARP request for an IP which belongs to the other segment if your network is built correctly.
The only meaningful use of this "ARP replying of all global addresses" I have found is to simplify IP "alias" management in certain situations by adding them to the loopback device rather than the real device when it is not known exactly which network segment the user/administrator intends the IP alias should be active within.
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