From: Stephan von Krawczynski <skraw@ithnet.com>
To: "David S. Miller" <davem@redhat.com>
Cc: richard@aspectgroup.co.uk, willy@w.ods.org,
alan@lxorguk.ukuu.org.uk, carlosev@newipnet.com,
lamont@scriptkiddie.org, davidsen@tmr.com, bloemsaa@xs4all.nl,
marcelo@conectiva.com.br, netdev@oss.sgi.com,
linux-net@vger.kernel.org, layes@loran.com, torvalds@osdl.org,
linux-kernel@vger.kernel.org
Subject: Re: [2.4 PATCH] bugfix: ARP respond on all devices
Date: Tue, 19 Aug 2003 19:10:10 +0200 [thread overview]
Message-ID: <20030819191010.43d83b79.skraw@ithnet.com> (raw)
In-Reply-To: <20030819095105.2cb9acc1.davem@redhat.com>
On Tue, 19 Aug 2003 09:51:05 -0700
"David S. Miller" <davem@redhat.com> wrote:
> On Tue, 19 Aug 2003 17:54:26 +0100
> Richard Underwood <richard@aspectgroup.co.uk> wrote:
>
> > When a HOST sends out an ARP request, it's NOT associated with a
> > single connection, it's associated with the host. Why should it pick a
> > "random" IP number to send as the source address?
>
> It's not "random", it is using the IP address it intends
> to use as the source in packets it will output once the
> ARP completes.
>
> In fact, if you look at the code in arp_solicit(), the source address
> is coming directly from the packet we are trying to output.
Well, then you have a problem, at least with RFC-985 as quoted in my other
email.
If your host has two interfaces on two different pyhsical nets and host A from
net A shall be contacted by a service bound to your interface on net B you will
obviously send an arp request with a source ip from wrong subnet.
I did not read the code, I take your code explanation as true, of course.
It is very likely you will not receive a valid answer in this case:
<quote RFC-985>
An ARP request is discarded if the source IP address is not in the same subnet.
</quote>
Regards,
Stephan
next prev parent reply other threads:[~2003-08-19 17:13 UTC|newest]
Thread overview: 164+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-19 16:54 [2.4 PATCH] bugfix: ARP respond on all devices Richard Underwood
2003-08-19 16:51 ` David S. Miller
2003-08-19 17:10 ` Stephan von Krawczynski [this message]
2003-08-19 17:07 ` David S. Miller
2003-08-19 19:57 ` bill davidsen
-- strict thread matches above, loose matches on Subject: below --
2003-08-20 20:10 Richard Underwood
2003-08-20 8:58 Richard Underwood
2003-08-20 15:23 ` jamal
2003-08-20 15:28 ` jamal
2003-08-19 22:12 Richard Underwood
2003-08-19 22:11 ` David S. Miller
2003-08-19 23:15 ` Stephan von Krawczynski
[not found] <mfYi.374.31@gated-at.bofh.it>
[not found] ` <mkbE.6Rk.35@gated-at.bofh.it>
2003-08-19 20:00 ` Andi Kleen
2003-08-19 19:56 ` David S. Miller
2003-08-19 19:00 Richard Underwood
2003-08-19 18:58 ` David S. Miller
[not found] <mdtk.Zy.1@gated-at.bofh.it>
[not found] ` <mgUv.3Wb.39@gated-at.bofh.it>
[not found] ` <mgUv.3Wb.37@gated-at.bofh.it>
[not found] ` <miMw.5yo.31@gated-at.bofh.it>
2003-08-19 18:48 ` Andi Kleen
2003-08-19 19:17 ` Daniel Gryniewicz
2003-08-19 19:21 ` Andi Kleen
2003-08-19 19:27 ` Daniel Gryniewicz
2003-08-19 19:24 ` David S. Miller
2003-08-19 19:32 ` Andi Kleen
2003-08-19 19:28 ` David S. Miller
2003-08-20 9:53 ` Alan Cox
2003-08-20 15:41 ` Stephan von Krawczynski
2003-08-20 15:38 ` David S. Miller
2003-08-19 19:38 ` Valdis.Kletnieks
2003-08-19 19:37 ` David S. Miller
2003-08-19 20:44 ` Valdis.Kletnieks
2003-08-19 18:16 Richard Underwood
2003-08-19 18:13 ` David S. Miller
2003-08-19 18:30 ` Bas Bloemsaat
2003-08-19 18:05 Richard Underwood
2003-08-19 18:21 ` David S. Miller
2003-08-20 12:52 ` Harley Stenzel
2003-08-19 17:56 Richard Underwood
2003-08-19 17:53 ` David S. Miller
2003-08-19 14:34 Richard Underwood
2003-08-19 14:54 ` Willy Tarreau
2003-08-19 15:07 ` Stephan von Krawczynski
2003-08-19 15:57 ` David S. Miller
2003-08-19 16:52 ` Stephan von Krawczynski
2003-08-19 16:53 ` David S. Miller
2003-08-19 17:12 ` Stephan von Krawczynski
2003-08-19 17:09 ` David S. Miller
2003-08-19 19:04 ` Alan Cox
2003-08-19 19:01 ` David S. Miller
2003-08-19 19:19 ` Bas Bloemsaat
2003-08-19 19:16 ` David S. Miller
2003-08-20 8:49 ` Roman Pletka
2003-08-20 14:15 ` Stephan von Krawczynski
2003-08-20 14:43 ` Roman Pletka
2003-08-20 15:55 ` Stephan von Krawczynski
2003-08-20 16:47 ` Roman Pletka
2003-08-19 15:53 ` Bill Davidsen
2003-08-19 16:14 ` David S. Miller
2003-08-19 17:17 ` Bill Davidsen
2003-08-19 19:08 ` Alan Cox
2003-08-19 21:53 ` Stephan von Krawczynski
2003-08-19 12:02 Richard Underwood
2003-08-19 12:35 ` Alan Cox
2003-08-19 18:30 ` Daniel Gryniewicz
2003-08-19 18:29 ` David S. Miller
2003-08-19 19:12 ` Daniel Gryniewicz
2003-08-19 19:10 ` David S. Miller
2003-08-20 16:49 ` Bill Davidsen
2003-08-20 17:00 ` David S. Miller
2003-08-20 17:44 ` Ben Greear
2003-08-20 17:48 ` David S. Miller
2003-08-20 23:18 ` Julian Anastasov
2003-08-23 20:50 ` Bill Davidsen
2003-08-20 19:08 ` Bill Davidsen
2003-08-20 20:07 ` Bas Bloemsaat
2003-08-19 19:42 ` bill davidsen
2003-08-19 13:11 ` Bas Bloemsaat
2003-08-19 15:34 ` David S. Miller
2003-08-19 17:39 ` Lars Marowsky-Bree
2003-08-19 17:36 ` David S. Miller
2003-08-19 21:01 ` Harley Stenzel
2003-08-19 16:19 ` Stephan von Krawczynski
2003-08-19 16:54 ` David S. Miller
2003-08-19 17:15 ` Stephan von Krawczynski
2003-08-19 16:56 ` David S. Miller
[not found] <e2Yb.5CB.17@gated-at.bofh.it>
[not found] ` <e43Y.6x0.17@gated-at.bofh.it>
[not found] ` <e43Y.6x0.19@gated-at.bofh.it>
[not found] ` <e43Y.6x0.21@gated-at.bofh.it>
[not found] ` <e43Y.6x0.23@gated-at.bofh.it>
[not found] ` <e43Y.6x0.25@gated-at.bofh.it>
[not found] ` <e43Y.6x0.15@gated-at.bofh.it>
[not found] ` <e4nd.6K9.5@gated-at.bofh.it>
[not found] ` <e4ne.6K9.11@gated-at.bofh.it>
[not found] ` <e4x3.6RV.23@gated-at.bofh.it>
[not found] ` <e4Qe.7cR.3@gated-at.bofh.it>
[not found] ` <e503.7kj.23@gated-at.bofh.it>
[not found] ` <e5jh.7yW.5@gated-at.bofh.it>
[not found] ` <edJU.6nT.25@gated-at.bofh.it>
2003-07-28 20:45 ` Julien Oster
2003-07-27 20:52 Bas Bloemsaat
2003-07-27 22:12 ` David S. Miller
2003-07-28 2:31 ` Ben Greear
2003-07-28 7:33 ` Bas Bloemsaat
2003-07-27 23:40 ` Carlos Velasco
2003-07-27 23:46 ` David S. Miller
2003-07-27 23:58 ` Carlos Velasco
2003-07-27 23:58 ` David S. Miller
2003-07-28 0:11 ` Carlos Velasco
2003-07-28 0:14 ` David S. Miller
2003-07-28 0:35 ` Carlos Velasco
2003-07-28 0:36 ` David S. Miller
2003-07-28 0:53 ` Carlos Velasco
2003-07-28 0:55 ` David S. Miller
2003-07-28 1:23 ` Carlos Velasco
2003-07-28 1:35 ` David S. Miller
2003-07-28 10:43 ` Carlos Velasco
2003-07-28 17:09 ` Phil Oester
2003-07-28 18:56 ` Bas Bloemsaat
2003-07-28 4:37 ` David Lang
2003-07-28 4:39 ` David S. Miller
2003-07-28 10:49 ` Carlos Velasco
2003-07-29 2:51 ` Bill Davidsen
2003-07-29 4:48 ` Lamont Granquist
2003-08-04 6:10 ` Pekka Savola
2003-08-17 13:09 ` Carlos Velasco
2003-08-17 13:16 ` Carlos Velasco
2003-08-17 13:41 ` Alan Cox
2003-08-17 13:55 ` Carlos Velasco
2003-08-17 15:12 ` Bernd Eckenfels
2003-08-17 15:28 ` Alan Cox
2003-08-17 15:57 ` Bas Bloemsaat
2003-08-17 15:59 ` Carlos Velasco
2003-08-17 16:26 ` Alan Cox
2003-08-17 16:27 ` Carlos Velasco
2003-08-17 17:24 ` Alan Cox
2003-08-17 22:48 ` Willy Tarreau
2003-08-18 5:22 ` David S. Miller
2003-08-18 6:56 ` Willy Tarreau
2003-08-18 7:01 ` David S. Miller
2003-08-18 7:29 ` Willy Tarreau
2003-08-18 7:43 ` Willy Tarreau
2003-08-18 5:31 ` David S. Miller
2003-08-18 11:39 ` Stephan von Krawczynski
2003-08-18 11:44 ` David S. Miller
2003-08-18 12:34 ` Stephan von Krawczynski
2003-08-18 12:30 ` David S. Miller
2003-08-18 12:51 ` Mr. James W. Laferriere
2003-08-18 12:53 ` Stephan von Krawczynski
2003-08-18 12:55 ` David S. Miller
2003-08-18 13:17 ` Stephan von Krawczynski
2003-08-18 13:14 ` David S. Miller
2003-08-18 14:23 ` Stephan von Krawczynski
2003-08-18 14:19 ` David S. Miller
2003-08-18 15:46 ` Stephan von Krawczynski
2003-08-18 13:23 ` jamal
2003-08-18 13:21 ` David S. Miller
2003-08-18 13:40 ` Stephan von Krawczynski
2003-08-20 6:55 ` Bas Bloemsaat
2003-08-18 21:54 ` Bill Davidsen
2003-08-18 13:40 ` Dominik Kubla
2003-08-18 12:51 ` Willy Tarreau
2003-08-18 12:53 ` David S. Miller
2003-08-18 14:28 ` Willy Tarreau
2003-08-18 14:28 ` David S. Miller
2003-08-18 12:08 ` Bas Bloemsaat
2003-08-18 12:03 ` David S. Miller
2003-08-18 21:32 ` Bill Davidsen
2003-08-19 3:21 ` Ben Greear
2003-08-19 15:22 ` David S. Miller
2003-08-19 7:58 ` Bas Bloemsaat
2003-08-17 16:51 ` David T Hollis
2003-08-17 16:45 ` Carlos Velasco
2003-08-17 17:13 ` Arjan van de Ven
2003-08-17 19:46 ` insecure
2003-08-18 5:11 ` David S. Miller
2003-08-18 5:29 ` David S. Miller
2003-08-17 13:59 ` Bas Bloemsaat
2003-08-18 10:48 ` Robert Collier
2003-08-17 13:38 ` Alan Cox
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