From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Ng Subject: Re: Multicast socket behaviour? Date: Thu, 14 Aug 2008 00:08:58 +0000 (UTC) Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from main.gmane.org ([80.91.229.2]:41267 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752865AbYHNAJY (ORCPT ); Wed, 13 Aug 2008 20:09:24 -0400 Received: from list by ciao.gmane.org with local (Exim 4.43) id 1KTQOq-00052y-53 for netdev@vger.kernel.org; Thu, 14 Aug 2008 00:09:19 +0000 Received: from CPE-124-190-96-129.vic.bigpond.net.au ([124.190.96.129]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 14 Aug 2008 00:09:08 +0000 Received: from daniel_ng11 by CPE-124-190-96-129.vic.bigpond.net.au with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 14 Aug 2008 00:09:08 +0000 Sender: netdev-owner@vger.kernel.org List-ID: David Stevens us.ibm.com> writes: > it usually doesn't make sense for an app in a single multicast > routing domain to want to join on multiple interfaces Now, what if I have a linear network of say 3 Linux boxes, connected together simply: A----PPP0-------B-----PPP1------C All machines are DVMRP multicast routers. In order for B to hear the multicast packets originated from both A and C, wouldn't B need to join the DVMRP multicast group on *both* its PPP interfaces? If so, then can this be done with a single socket? How? Daniel