From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vlad Yasevich Subject: Re: [Lksctp-developers] Fw: Intermittent SCTP multihoming breakage Date: Mon, 05 Feb 2007 12:07:39 -0500 Message-ID: <45C7645B.7070009@hp.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, lksctp-developers@lists.sourceforge.net, Sridhar Samudrala To: Steve Hill Return-path: Received: from mailhub.hp.com ([192.151.27.10]:59665 "EHLO mailhub.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751860AbXBERHm (ORCPT ); Mon, 5 Feb 2007 12:07:42 -0500 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Hi Steve Steve Hill wrote: > Vlad Yasevich wrote on 05 February 2007 16:39: > >> Once you start simulating the network failure, how long do you wait? >> >> If you have not changed rto_max and path_max_retrans, you can end up >> waiting quite a while for the full path switchover. This will also >> severely slow down your retransmissions... > > I'm waiting several minutes, and I'm using setsockopt() to set the > timeouts fairly low: > srto_initial = 1000ms > srto_min = 200ms > srto_max = 1400ms > spp_pathmaxrxt = 2 > spp_hbinterval = 1000ms Ok, thanks for the info. Two more questions: 1. What did you set the sinfo_timetolive to? 2. What specific netfilter rule to do use to simulate network outage? I was using '-t filter -A INPUT -i eth0 -p sctp -j DROP' Just trying to get more info to simulate this. My prior attempts recovered quickly with my patch. Thanks -vlad > > The network's round trip time (indicated by ping) is on the order of > <0.25ms. > > - Steve Hill > Software Engineer > Dialogic > Fordingbridge, Hampshire, UK > +44-1425-651392 > steve.hill@dialogic.com >