From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: networking problems between vms Date: Tue, 08 Feb 2011 12:16:41 +0200 Message-ID: <4D511809.1080805@redhat.com> References: <4D4FC0BD.9050801@vcordes.info> <4D4FCC73.1030104@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Volker Cordes Return-path: Received: from mx1.redhat.com ([209.132.183.28]:51978 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752630Ab1BHKQy (ORCPT ); Tue, 8 Feb 2011 05:16:54 -0500 In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On 02/07/2011 01:27 PM, Volker Cordes wrote: > Avi Kivity redhat.com> writes: > > > > > On 02/07/2011 11:51 AM, Volker Cordes wrote: > > > Hello, > > > > > > I'm running 4 virtual machines on one host, connected by a network > > > bridge on the host (IP 192.168.0.1). All TAP devices get added to that > > > bridge when starting the vm: > > > > > > brctl show > > > bridge name bridge id STP enabled interfaces > > > br0 8000.52fd3fbd954e no tap01 > > > tap02 > > > tap03 > > > tap04 > > > > > > I use virtio networking (but tried the e1000 driver, too). The vms have > > > static IPs 192.168.0.250 - 253 with 192.168.0.1 as the gateway. > > > Connecting from the host to the machines and from the machines to the > > > internet works just fine. The problem lies in connecting from one > > > machine to another. There is a 30 seconds delay until the connection > > > gets established, I tried ssh, http and mysql. After the connection is > > > there, the speed seems to be normal. > > > > > > Any hints would be appreciated. > > > > > > > Does > > > > brctl setfd br0 0.5 > > > > help? > > > > No does not help. The bridge is created in /etc/network/interfaces (debian): > > iface tap0 inet manual > auto br0 > iface br0 inet static > bridge_ports tap0 > bridge_stp off > bridge_maxwait 0 > bridge_fd 0 > address 192.168.0.1 > netmask 255.255.255.0 > > I'm using kvm version: > QEMU emulator version 0.13.0 (qemu-kvm-0.13.0 Debian 0.13.0+dfsg-2), Copyright > (c) 2003-2008 Fabrice Bellard > with kvm_intel > > on kernel: > Linux example.com 2.6.32-5-amd64 #1 SMP Wed Jan 12 03:40:32 UTC 2011 x86_64 > GNU/Linux > > I also tried -no-kvm, -no-kvm-irqchip and -no-kvm-pit. Didn't help. > > Even connecting to the local machine has this 30 seconds delay (only if I use > 192..., localhost is ok) > > Check reverse dns resolution and firewall rules. Don't seem to be a kvm problem. -- error compiling committee.c: too many arguments to function