|To:||"David S. Miller" <davem@xxxxxxxxxx>|
|Subject:||Re: [2.4 PATCH] bugfix: ARP respond on all devices|
|From:||Harley Stenzel <hstenzel@xxxxxxxxxx>|
|Date:||Wed, 20 Aug 2003 08:52:09 -0400|
|Cc:||Richard Underwood <richard@xxxxxxxxxxxxxxxxx>, skraw@xxxxxxxxxx, willy@xxxxxxxxx, alan@xxxxxxxxxxxxxxxxxxx, carlosev@xxxxxxxxxxxx, lamont@xxxxxxxxxxxxxxxx, davidsen@xxxxxxx, bloemsaa@xxxxxxxxx, marcelo@xxxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx, linux-net@xxxxxxxxxxxxxxx, layes@xxxxxxxxx, torvalds@xxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx|
|User-agent:||Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030625|
David S. Miller wrote:
On Tue, 19 Aug 2003 19:05:13 +0100 Richard Underwood <richard@xxxxxxxxxxxxxxxxx> wrote:
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.
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