On Sat, 2 Aug 2003 11:13:11 -0500 stefmit <[EMAIL PROTECTED]> wrote: > running different IP networks, even though on the same infrastructure. > So one could end up with two PCs, apparently on the same second layer > connection, which could not talk to each other except for routing > through the provider,
Usually, the reason for this is that while adjacent PCs are able to see each other, and surprise, they may even see and respond to each other's ARPs... but... ARP replies are taken in as they arrive. So what happens is that if an ARP query/reply pair do succeed on the local network, a router can reply with a Proxy ARP reply becuause the router *knows* how to route the packets -- the problem arises because the proxy ARP reply arrives after the real, more direct one, and the proxy overwrites the original. Technically, the local pair of hosts do see each other _momentarily_; but a proxy reply highjacks the direct connection...
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