From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: KVM doesn't send an arp announce after live migrating a domain Date: Wed, 25 Aug 2010 13:40:19 +0300 Message-ID: <4C74F313.6040604@redhat.com> References: <4C74CBB0.7080203@kangaroot.net> <20100825083812.GG10499@redhat.com> <4C74E091.60100@kangaroot.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Gleb Natapov , kvm@vger.kernel.org, libvir-list@redhat.com To: Nils Cant Return-path: Received: from mx1.redhat.com ([209.132.183.28]:38961 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752654Ab0HYKkg (ORCPT ); Wed, 25 Aug 2010 06:40:36 -0400 In-Reply-To: <4C74E091.60100@kangaroot.net> Sender: kvm-owner@vger.kernel.org List-ID: On 08/25/2010 12:21 PM, Nils Cant wrote: > On 08/25/2010 10:38 AM, Gleb Natapov wrote: >> qemu sends gratuitous ARP after migration. Check forward delay >> setting on your >> bridge interface. It should be set to zero. >> > > Aha! That fixed it. Turns out that debian bridge-utils sets the > default to 15 for bridges. > Manually setting it to 0 with 'brctl setfd br0 0' or setting the > 'bridge_fd' parameter to 0 in /etc/network/interfaces solves the issue. > I think libvirt is doing something about this, copying list for further info. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.