[CentOS] Xen Networking Issue with CentOS 5.1

Gary Richardson gary.richardson at gmail.com
Fri Dec 28 16:00:07 UTC 2007


I think, but don't know for a fact, that if you don't specify a bridge
interface in your config, you'll get a 'nat' address in your domU. I posted
about it in my blog:
http://yablog-gary.blogspot.com/2007/12/xen-what-i-learned-today.html --
maybe that will get you on the right track?
thanks.

On Dec 27, 2007 5:19 PM, Joseph L. Casale <jcasale at activenetwerx.com> wrote:

> Hi,
> I tried this post on the Xen list first with no answer. I have 4 machines
> and 3 of which (all different) have no network access when booted into Xen.
> I tried using Fedora Core 8 and it produced the same results. Is it normal
> for the virbr0 interface to take an arbitrary IP? How does it decide what to
> use? An ifconfig when booted into Xen shows the following:
>
> eth0      Link encap:Ethernet  HWaddr 00:0C:29:4A:69:63
>          inet addr:192.168.5.30  Bcast:192.168.5.255  Mask:255.255.255.0
>          inet6 addr: fe80::20c:29ff:fe4a:6963/64 Scope:Link
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:25 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:1763 (1.7 KiB)  TX bytes:594 (594.0 b)
>
> lo        Link encap:Local Loopback
>          inet addr:127.0.0.1  Mask:255.0.0.0
>          inet6 addr: ::1/128 Scope:Host
>          UP LOOPBACK RUNNING  MTU:16436  Metric:1
>          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:336 (336.0 b)  TX bytes:336 (336.0 b)
>
> peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
>          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
>          RX packets:28 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:21 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:1943 (1.8 KiB)  TX bytes:1314 (1.2 KiB)
>          Interrupt:17 Base address:0x1400
>
> vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
>          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
>          RX packets:9 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:25 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:594 (594.0 b)  TX bytes:1763 (1.7 KiB)
>
> 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:6 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:0 (0.0 b)  TX bytes:468 (468.0 b)
>
> xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
>          inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
>          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
>          RX packets:34 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:1881 (1.8 KiB)  TX bytes:0 (0.0 b)
>
> Thanks for any pointers!
> jlc
>
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