From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265925AbTLIO7u (ORCPT ); Tue, 9 Dec 2003 09:59:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265933AbTLIO7t (ORCPT ); Tue, 9 Dec 2003 09:59:49 -0500 Received: from codeblau.walledcity.de ([212.84.209.34]:28682 "EHLO codeblau.de") by vger.kernel.org with ESMTP id S265925AbTLIO63 (ORCPT ); Tue, 9 Dec 2003 09:58:29 -0500 Date: Tue, 9 Dec 2003 15:58:47 +0100 From: Felix von Leitner To: linux-kernel@vger.kernel.org Subject: /proc/sys/net/ipv4/config/eth0/arp_filter not working? Message-ID: <20031209145847.GA10652@codeblau.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! I'm having trouble with the Linux kernel answering ARP requests it shouldn't answer. In particular, I have added the IP 10.0.0.23 to lo using ip from iproute2. On another machine, I have added the IP 10.0.0.23 to eth0 using ip. Now, an ARP request from a third machine is answered by both. According to the documentation I found, the kernel (2.6.0-test11) should not answer ARP requests for the lo alias if I write 1 to /proc/sys/net/ipv4/config/eth0/arp_filter, and to be on the safe side, I also wrote 1 to /proc/sys/net/ipv4/config/lo/arp_filter. However, the kernel still answers the ARP requests. Any takers? Felix