From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dor Laor Subject: Re: Do I set up separate bridges for each guest? Date: Tue, 20 Oct 2009 10:20:03 +0200 Message-ID: <4ADD72B3.5010009@redhat.com> References: <3AADB0615CD24113B3AA96DA46AB6BD0@neilhp> Reply-To: dlaor@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: Neil Aggarwal Return-path: Received: from mx1.redhat.com ([209.132.183.28]:51426 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751062AbZJTIUC (ORCPT ); Tue, 20 Oct 2009 04:20:02 -0400 In-Reply-To: <3AADB0615CD24113B3AA96DA46AB6BD0@neilhp> Sender: kvm-owner@vger.kernel.org List-ID: On 10/20/2009 04:37 AM, Neil Aggarwal wrote: > Hello: > > I am installing KVM on top of CentOS 5.4 so I can > have two guests running on my host. I would like to > have the host and guests accessible from my > network. > > Do I set up separate bridges for each guest or would > they somehow be shared? > > If I set up separate bridges, I think I need to do > in /etc/sysconfig/network-scripts on the host machine: > > 1. Set up ifcfg-eth0 with the ip information of the > host (For example 192.168.2.200) > 2. Set up ifcfg-eth0:1 for the first guest. It will > have BRIDGE=br1 > 3. Create ifcfg-br1 with the IP info for the first > guest (For example 192.168.2.201) > 4. Set up ifcfg-eth0:2 for the second guest. It will > have BRIDGE=br2 > 5. Create ifcfg-br2 with the IP info for the second > guest (For example 192.168.2.202) > > Is this correct or did I miss something? The simplest thing is to use a single bridge for all - The physical nic should be part of it and supply the outside world connection. The physical nic doesn't need an IP and the bridge should own it. All vms can use this bridge. cat /etc/sysconfig/network-scripts/ifcfg-br0 DEVICE=br0 TYPE=Bridge ONBOOT=yes GATEWAYDEV='' BOOTPROTO=dhcp DELAY=0 HWADDR=00:14:5E:17:D0:04 # cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 ONBOOT=yes BOOTPROTO=none HWADDR=00:14:5E:17:D0:04 BRIDGE=br0 > > Thanks, > Neil > > > -- > Neil Aggarwal, (281)846-8957, www.JAMMConsulting.com > Will your e-commerce site go offline if you have > a DB server failure, fiber cut, flood, fire, or other disaster? > If so, ask about our geographically redundant database system. > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html