My first guess would be a Virtual Bridge 0 interface. Did you decide to install Xen during the 5.2 installation? If so then it would automatically start up its network bridge to connect your Xen Guests to your local network (if you mapped the Xen Guest interface to work on this bridge).
Trevor
> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On
> Behalf Of Ivan Varbanov
> Sent: Thursday, August 14, 2008 12:06 AM
> To: CentOS mailing list
> Subject: Re: What is vibr0 Network interface and what is it
> used for
>
> It comes from virtual bridge (if you use vm,xen ...).
>
> On Wed, Aug 13, 2008 at 7:54 AM, Lunix1618 <lunix1618@xxxxxxxxx>wrote:
> Hello,
>
> I have see that my machine have an interface that named virbr0. I have
> no idea what is it and what it using for ? I am not configured any IP
> address for it but I see it had an IP address and see it listed in
> firewall config.
> Can anyone give me an explanation about this or point me to a document
> that describe it ?
>
> My machine running CentOS 5.2 and do not have internet connection from
> the installation time.
>
> Thanks,
>
>
> virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00 inet
> addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
> inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:35 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:0 (0.0 b) TX bytes:9143 (8.9 KiB)
>
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