Re: [Xen-users] Get Network on DomU

[Alexandre Kouznetsov <alk@xxxxxxxxxx>]

Hello again.

El 12/09/13 06:24, Dorian escribió:
> Now about my network:
> My hypervisor is configured with a working bridge
> [...]
>  >> brctl show
> bridge name    bridge id        STP enabled    interfaces
> pan0        8000.feffffffffff    no        vif1.0
>                              vif2.0
> xenbr0 8000.002655c46159    no        eth0
You VM's network seems to be attached to a pan0, and there is no 
physical interface to the outside world in that bridge. If you mean your 
VM's to have a network interface within the same network as your Dom0's 
eth0, change their's config files. Make them to be attached to xenbr0.
>  From the DomU guest I got the following and no internet:
> xm console Machin-chose-cpt.net
> [ 1737.324143] Setting capacity to 8388608
> [ 1737.326271] Setting capacity to 1048576
> [ 1737.327052] Setting capacity to 8388608
> [ 1737.373784] Setting capacity to 1048576
>
> root@Machin-chose-cpt:~# ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:16:3e:5f:81:78
>            inet6 addr: fe80::216:3eff:fe5f:8178/64 Scope:Link
>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>            RX packets:40 errors:0 dropped:0 overruns:0 frame:0
>            TX packets:56 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:8262 (8.0 KiB)  TX bytes:17568 (17.1 KiB)
>            Interrupt:19
>
> 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:0 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:0 (0.0 B)  TX bytes:0 (0.0 B)
>
> # grep -E -v '^(#)' /etc/network/interfaces
> auto lo
> iface lo inet loopback
> auto eth0
> iface eth0 inet dhcp
Unless one your VM's have a DHCP server, this won't work aether. If you 
attach you VM to xenbr0 AND there is a working DHCP server on your 
network, nothing need to be changed here, your VM will get a address 
form you regular DHCP server.
> I've to inform that upon creation of this DomU, the system advices about
> Networking will not work since there is a missing network-script or
> vif-script.
> Here is what I have in root@debian:/home/dorian#
>   grep -E -v ^# /etc/xen/xend-config.sxp
>
>   (vif-script vif-bridge)
A common approach, at least on Debian, is to drop Xen's stock network 
scripts and create the necessary bridges by OS's means, from 
/etc/network/interfaces. This would give you more solid and predictible 
setup.
There are plenty of examples in this list's archive.

Greetings.

--
Alexandre Kouznetsov


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