If the networks are different (which is what I was trying to explain in my
scenario), the IP layer would be looking for its gateway, in order to reach
the other end ('s network), thus the data link won't ever see an ARP for the
neighbor's PC MAC address, as the sender won't even look for it - it would
look for the MAC of the gateway/router. Thus - even if on the same hub/switch
- with two different networks the ARP won't ever refer/look for the
neighbor...
Stef
On Saturday 02 August 2003 01:07 pm, Pierre Fortin wrote:
> 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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