From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752389Ab0AYIKj (ORCPT ); Mon, 25 Jan 2010 03:10:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751665Ab0AYIKi (ORCPT ); Mon, 25 Jan 2010 03:10:38 -0500 Received: from gw1.cosmosbay.com ([212.99.114.194]:32928 "EHLO gw1.cosmosbay.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751193Ab0AYIKi (ORCPT ); Mon, 25 Jan 2010 03:10:38 -0500 Message-ID: <4B5D51E6.5090601@gmail.com> Date: Mon, 25 Jan 2010 09:10:14 +0100 From: Eric Dumazet User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:1.9.1.7) Gecko/20100111 Thunderbird/3.0.1 MIME-Version: 1.0 To: Curt Sampson , linux-kernel@vger.kernel.org, Linux Netdev List Subject: Re: Problems Receiving UDP Broadcasts on Some Versions of Linux References: <20100125072749.GG21419@analytic.cynic.net> In-Reply-To: <20100125072749.GG21419@analytic.cynic.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-1.6 (gw1.cosmosbay.com [0.0.0.0]); Mon, 25 Jan 2010 09:10:15 +0100 (CET) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 25/01/2010 08:27, Curt Sampson a écrit : > I'm posting this here because it smells as if it may be something > a where a kernel network code developer might just say, "oh yeah, > obviously your problem is this." > > I'm not subscribed to this list, so please cc me on any replies. (The > Mail-followup-to header may do this automatically for you.) > > The short summary is that on two very similar servers on the same > network, an application that listens for broadcast UDP packets on a > given port works fine on the Ubuntu 8.04/Linux 2.6.24-26-server box but > does not receive the packets on the Ubuntu 9.04/Linux 2.6.28-17-server > box. I have confirmed that tcpdump sees identical packets being received > on both hosts. > > Did something change between these two kernel revisions that I need to > listen differently? > > Full details, including sample code, are available at: > > http://stackoverflow.com/questions/2130563/udp-broadcast-reception-problems-with-ubuntu-9-04-but-not-8-04 > > Thanks for any help you can give me. Even if you're not sure, but have > clues I should consider following up, feel free to e-mail me. I'm > also happy to take pointers to kernel code I should read, if there's > enlightenment there. > > cjs Hi Curt Could you post a sample of tcpdump trafic you receive on the 9.04 host, and your network config ? "ifconfig -a"