From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270391AbTHQQxh (ORCPT ); Sun, 17 Aug 2003 12:53:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270383AbTHQQxh (ORCPT ); Sun, 17 Aug 2003 12:53:37 -0400 Received: from user-0cal2fl.cable.mindspring.com ([24.170.137.245]:3200 "EHLO bender.davehollis.com") by vger.kernel.org with ESMTP id S270378AbTHQQxd (ORCPT ); Sun, 17 Aug 2003 12:53:33 -0400 Message-ID: <3F3FB275.3090601@davehollis.com> Date: Sun, 17 Aug 2003 12:51:01 -0400 From: David T Hollis User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030630 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Carlos Velasco CC: Alan Cox , Lamont Granquist , Bill Davidsen , "David S. Miller" , bloemsaa@xs4all.nl, Marcelo Tosatti , netdev@oss.sgi.com, linux-net@vger.kernel.org, layes@loran.com, torvalds@osdl.org, Linux Kernel Mailing List Subject: Re: [2.4 PATCH] bugfix: ARP respond on all devices References: <20030728213933.F81299@coredump.scriptkiddie.org> <200308171509570955.003E4FEC@192.168.128.16> <200308171516090038.0043F977@192.168.128.16> <1061127715.21885.35.camel@dhcp23.swansea.linux.org.uk> <200308171555280781.0067FB36@192.168.128.16> <1061134091.21886.40.camel@dhcp23.swansea.linux.org.uk> <200308171759540391.00AA8CAB@192.168.128.16> In-Reply-To: <200308171759540391.00AA8CAB@192.168.128.16> X-Enigmail-Version: 0.76.5.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Carlos Velasco wrote: >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 > > >- >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html >Please read the FAQ at http://www.tux.org/lkml/ > > Check out: http://www.linuxvirtualserver.org/docs/arp.html. I understand the problem you're talking about. It's not a 'bug', it's a feature! You need to use the hidden interface approach to have the back end system not broadcast it's MAC for the virtual IP.