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SubjectRe: [2.4 PATCH] bugfix: ARP respond on all devices
David S. Miller wrote:
> On Tue, 19 Aug 2003 19:05:13 +0100
> Richard Underwood <richard@aspectgroup.co.uk> wrote:
>
>> The ARP request represents all FUTURE
>>packets being sent out that interface, not just the one single packet that
>>happened to kick of this ARP request.
>
> That's RIGHT! And by your own argument the source address
> in the ARP request IS IRRELEVANT and is to be ignored!
>

The source address in the ARP request is not irrelevant, because a
broadcast arp request causes all recipients of that broadcast request to
update their arp cache entry (if they have a cache entry for that IP)
for the IP specified in the source with the MAC specified in the request.

So, in an environment where a single address is aliased in multiple
places, such as tunnel endpoints and loopback aliases, and in
multi-homed same-segment configs, it is unpredictable asto which IP will
be bound to which MAC for every machine (or arp cache) on the network.

--Harley




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