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Re: [2.4 PATCH] bugfix: ARP respond on all devices

To: "Alan Cox" <alan@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [2.4 PATCH] bugfix: ARP respond on all devices
From: "Carlos Velasco" <carlosev@xxxxxxxxxxxx>
Date: Sun, 17 Aug 2003 17:59:54 +0200
Cc: "Lamont Granquist" <lamont@xxxxxxxxxxxxxxxx>, "Bill Davidsen" <davidsen@xxxxxxx>, "David S. Miller" <davem@xxxxxxxxxx>, bloemsaa@xxxxxxxxx, "Marcelo Tosatti" <marcelo@xxxxxxxxxxxxxxxx>, netdev@xxxxxxxxxxx, linux-net@xxxxxxxxxxxxxxx, layes@xxxxxxxxx, torvalds@xxxxxxxx, "Linux Kernel Mailing List" <linux-kernel@xxxxxxxxxxxxxxx>
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On 17/08/2003 at 16:28 Alan Cox wrote:

>Linux doesn't issue "bad" requests. Linux will reply when it is
>asked for an address that it owns, as per RFC826, unless you chose
>to change the behaviour with things like arpfilter.

We are not talking about ARP Replies, we are talking about ARP
Requests.
You can see the Richard post here, same issue I reported several weeks
ago:
http://marc.theaimsgroup.com/?l=linux-net&m=106094924813337&w=2

==
        On eth0, we see:

11:23:55.650514 0:4:75:ca:c4:ef Broadcast arp 42: arp who-has
10.10.10.1
tell 212.xxx.yyy.9
==

Linux is sending an ARP Request to a LAN where the source IP address of
the packet has not any sense in that IP network.
And, at least, 2 RFCs are stating that other devices should not reply
to this packet. Currently know Cisco, Foundry; possibly others, and
possibly others coming as ARP storms are not desired.

Regards,
Carlos Velasco



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