Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754034AbZFDXUO (ORCPT ); Thu, 4 Jun 2009 19:20:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752523AbZFDXUD (ORCPT ); Thu, 4 Jun 2009 19:20:03 -0400 Received: from mail.lang.hm ([64.81.33.126]:38507 "EHLO bifrost.lang.hm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752281AbZFDXUC (ORCPT ); Thu, 4 Jun 2009 19:20:02 -0400 Date: Thu, 4 Jun 2009 16:19:56 -0700 (PDT) From: david@lang.hm X-X-Sender: dlang@asgard To: Alexander Clouter cc: linux-kernel@vger.kernel.org Subject: Re: When does Linux drop UDP packets? In-Reply-To: Message-ID: References: <20090604145347.GA27692@miyuki> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1061 Lines: 28 On Thu, 4 Jun 2009, Alexander Clouter wrote: > Philipp Reh wrote: >> >> I have the following setting in which a client that resides on the same >> physical network as a server wants to receive any UDP packet that >> arrives on any of its interfaces sent by that server. >> > Read up about multicasting, it will do what you want, does not depend on > the IP address of the destination workstation and will also cross > subnets if you want it to. > > It's dead easy to transmit and receive multicast traffic, broadcasting > network traffic is so 1980's :) there is only a difference between multicast and broadcast traffic if you are spanning subnets. but the issue here is the rp_filter, and that would also filter out multicast packets from sources that you don't have routes to. David Lang -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/