Re: Do I set up separate bridges for each guest?

[Dor Laor <dlaor@redhat.com>]

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
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