[CentOS] Xen Networking Issue with CentOS 5.1

Centos centos at bartbaars.nl
Fri Dec 28 16:10:52 UTC 2007


What is you actual problem? No networking or a strange ip?

CentOS uses virbr0 as the default and dnsmasc is issuing ip's 
(192.168.1.x I believe) on this network (correct me if I'm wrong!). 
xenbr0 is bridging the normal network.

I disabled the virbr0 using virsh and now all my domainU's use xenbr0. 
You can also specify what bridge to use in de domainU-config-file 
(/etc/xen/)

Cheers,

Bart

Joseph L. Casale 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
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>   



More information about the CentOS mailing list