Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 26 Oct 2001 10:02:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 26 Oct 2001 10:01:56 -0400 Received: from tux.rsn.bth.se ([194.47.143.135]:45031 "EHLO tux.rsn.bth.se") by vger.kernel.org with ESMTP id ; Fri, 26 Oct 2001 10:01:45 -0400 Date: Fri, 26 Oct 2001 16:01:29 +0200 (CEST) From: Martin Josefsson To: Anuradha Ratnaweera cc: "Jeffrey H. Ingber" , linux-kernel@vger.kernel.org Subject: Re: Other computers HIGHLY degrading network performance (DoS?) In-Reply-To: <20011026101313.A18310@bee.lk> Message-ID: X-message-flag: Get yourself a real mail client! http://www.washington.edu/pine/ MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 26 Oct 2001, Anuradha Ratnaweera wrote: > > One machine begins an intensive downloading job. How can this degrade the > > network performance even for ICMP packets between another machine and the > > router? Notice that this can't be collitions because the download goes at > > 64kbps and the local network is 100 Mbps. Something funny is going on to > > stop other people's packets. > > Just found out that this is _not_ a problem of the "download accelerator", but > something to do with queuing algorithm of the router. Even a normal wget > process or a big mail has a big impart on the network. Hopefully an iptables > firewall would solve the problem. I'd advice you to seriously look over your network, are you 100% sure you don't have a duplex-issue anywhere? I've been running linuxrouters for quite a while and right now I have a few linuxrouters routing 100Mbit/s internetconnections. We have never had any problems like the one you describe so my first guess would be that you have a duplexproblem, probably between the linuxrouter and the switch it's connected to on the inside, that's usually where it's located. Or maybe between some switches or something but do look into this. I seriously doubt that this a problem with the networking in linux. /Martin Never argue with an idiot. They drag you down to their level, then beat you with experience. - 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/