From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S272057AbTHSQFN (ORCPT ); Tue, 19 Aug 2003 12:05:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S271939AbTHSQEu (ORCPT ); Tue, 19 Aug 2003 12:04:50 -0400 Received: from pizda.ninka.net ([216.101.162.242]:16010 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id S271704AbTHSQEn (ORCPT ); Tue, 19 Aug 2003 12:04:43 -0400 Date: Tue, 19 Aug 2003 08:57:17 -0700 From: "David S. Miller" To: Stephan von Krawczynski Cc: willy@w.ods.org, richard@aspectgroup.co.uk, 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 Message-Id: <20030819085717.56046afd.davem@redhat.com> In-Reply-To: <20030819170751.2b92ba2e.skraw@ithnet.com> References: <353568DCBAE06148B70767C1B1A93E625EAB58@post.pc.aspectgroup.co.uk> <20030819145403.GA3407@alpha.home.local> <20030819170751.2b92ba2e.skraw@ithnet.com> X-Mailer: Sylpheed version 0.9.2 (GTK+ 1.2.6; sparc-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 19 Aug 2003 17:07:51 +0200 Stephan von Krawczynski wrote: > Hm, what rule is broken by the remote host, then? It means that systems (like Linux) that make IP addresses owned by the host instead of specific interfaces cannot correctly interoperate with such remote systems. It is also the case that a host cannot possibly be aware of all subnets present on a given LAN, therefore is should be liberal in it's replies to ARP requests. Finally, it violates the most basic rule of IP networking: "Be liberal in what you accept, and conservative in what you send" -Jon Postel In general, when a host posses the information necessary to allow other hosts to communicate, it should provide that information whenever possible.