From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757418AbYHHBfV (ORCPT ); Thu, 7 Aug 2008 21:35:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752211AbYHHBfI (ORCPT ); Thu, 7 Aug 2008 21:35:08 -0400 Received: from main.gmane.org ([80.91.229.2]:55209 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752166AbYHHBfH (ORCPT ); Thu, 7 Aug 2008 21:35:07 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Daniel Ng Subject: IPv4 Unnumbered Multicast? Date: Fri, 8 Aug 2008 01:28:20 +0000 (UTC) Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: main.gmane.org User-Agent: Loom/3.14 (http://gmane.org/) X-Loom-IP: 124.190.96.129 (Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Would someone please tell me if the latest kernel is able to handle Multicast IGMP Joins and sending of Multicast packets on multiple Unnumbered PPP links? As you probably know, for IPv4, Unnumbered PPP links 'share' the IP address of another interface on the same machine. Therefore, you could potentially have multiple PPP links on one machine, all with exactly the same local IP address. We might want any number of these PPP interfaces to join the same Multicast Group. Can we multicast send/receive in this scenario? The setsockopt() IP_MULTICAST_IF and IP_ADD_MEMBERSHIP options only seem to distinguish interfaces by their IP address. Cheers, Daniel