From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754253AbXHGEa5 (ORCPT ); Tue, 7 Aug 2007 00:30:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759103AbXHGEap (ORCPT ); Tue, 7 Aug 2007 00:30:45 -0400 Received: from smtpout.mac.com ([17.250.248.172]:58660 "EHLO smtpout.mac.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752174AbXHGEan (ORCPT ); Tue, 7 Aug 2007 00:30:43 -0400 In-Reply-To: <1186443467.11680.1204059001@webmail.messagingengine.com> References: <1186443467.11680.1204059001@webmail.messagingengine.com> Mime-Version: 1.0 (Apple Message framework v752.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <6CADE9C0-2EE3-4404-B33B-0941533933D2@mac.com> Cc: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 7bit From: Kyle Moffett Subject: Re: Creating virtual interface triggers an IGMPv3 Join to Multicast DNS Date: Tue, 7 Aug 2007 00:30:36 -0400 To: Adam M X-Mailer: Apple Mail (2.752.2) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Aug 06, 2007, at 19:37:47, Adam M wrote: > Hi folks, > > For some reason, every time I create a virtual interface (using > tun), the interface immediately generates an IGMPv3 Join packet for > group 224.0.0.251, which (according to Google) is Multicast DNS. > > This packet is generated automatically and consistently. I'm > wondering why this should be the case, and if it can be disabled. You don't happen to be running "avahi" or one of the other Zeroconf/ Bonjour/Rendezvous/$P2P_BUZZWORD_OF_THE_WEEK local-network-discovery daemons, do you? Most of those keep an eye out for new network interfaces and automatically start pushing multicast packets down them as soon as they appear, which is the most likely explanation for what you are seeing; as opposed to a kernel issue. Cheers, Kyle Moffett