Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753940AbXECWXq (ORCPT ); Thu, 3 May 2007 18:23:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754426AbXECWXq (ORCPT ); Thu, 3 May 2007 18:23:46 -0400 Received: from 1wt.eu ([62.212.114.60]:2479 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753589AbXECWXp (ORCPT ); Thu, 3 May 2007 18:23:45 -0400 Date: Fri, 4 May 2007 00:23:34 +0200 From: Willy Tarreau To: =?iso-8859-1?Q?=D8yvind_V=E5gen_J=E6gtnes?= Cc: Jan Engelhardt , Linux Kernel Mailing List Subject: Re: Routing 600+ vlan's via linux problems (looks like arp problems) Message-ID: <20070503222334.GD943@1wt.eu> References: <20070503205341.GB943@1wt.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1978 Lines: 54 On Thu, May 03, 2007 at 11:12:09PM +0200, ?yvind V?gen J?gtnes wrote: > On 5/3/07, Jan Engelhardt wrote: > > > >On May 3 2007 22:53, Willy Tarreau wrote: > >>> For the rest all we see in the arp cache is (incomplete) > >> > >>I suspect that your arp cache is full (128 entries by default). > >>Check /proc/sys/net/ipv4/neigh/gc_thresh1 (128 for me). You can > >>set it as high as gc_thresh2 (512 for me), and I don't know what > >>happens above. > > > >Above, you will perhaps need the not-so-elegant userspace arpd :-/ > > Yes, i was suspecting that the arp cache got full, but i will try > increasing it :) > Would there be any huge bugs if i change these lines in arp.c: > > .gc_thresh1 = 128, > .gc_thresh2 = 512, > > to > > .gc_thresh1 = 700, > .gc_thresh2 = 700, > > under the definition for struct arp_tbl? I don't think it could cause a problem, but network people will surely correct me if I'm wrong. > This setup will only run for about 1-2 hours while we fix the hardware > router (it is running now, but only on a backup flash card solution. > the harddrive in it died ;) Huhhh! Please tell us exactly what make and model of ROUTER you are using which embeds a HARD DRIVE, so that we recall never to buy that ! Having seen uptimes of 5 years on moderately big access routers, I would have find it awful to see them die multiple times in that timeframe because of a crappy IDE drive inside ! > I have been looking at arpd, but i quickly discarded it as an option > since its marked both experimental and obsolete ;) I never dared to try it either, and since 512 has always been enough for me, anything above is unknown area to me :-) Regards, Willy - 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/