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Re: [Xen-users] strange network problem

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] strange network problem
From: "Sebastian Reitenbach" <sebastia@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 21 Nov 2007 09:54:33 +0100
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Reply-to: Sebastian Reitenbach <sebastia@xxxxxxxxxxxxxxxxxxxx>
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Sebastian Reitenbach <sebastia@xxxxxxxxxxxxxxxxxxxx> wrote: 
> Hi,
> I some problem setup networking on a opensuse 10.3, x86_64, xen 3.1.0.
> I have four suse 10.3, x86_64 PVM hosts running on it, they are connected 
> via a bridge to get network.
> I can connect from external hosts, to the virtual machine, and from the 
> virtual machines to the internet, no problem. But I cannot reach the dom0 
> from within the domU's or vice versa. Also the domU's are able to 
> communicate with each other via that bridge, so forwarding etc is active.
> brctl show xenbr0
> bridge name     bridge id               STP enabled     interfaces
> xenbr0          8000.001871874e9d       no              vif45.0
>                                                         vif46.0
>                                                         eth1
>                                                         vif47.0
>                                                         vif48.0
> Only after I added the four host routes to the domU's I was able to 
> communicate between dom0 and domU. I have another Xen server, running 
> sles10, there I did not had to add these explicit routes.
> netstat -rn
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags   MSS Window  irtt 
> Iface
> UH        0 0          0 
> xenbr0
> UH        0 0          0 
> xenbr0
> UH        0 0          0 
> xenbr0
> UH        0 0          0 
> xenbr0
>   U         0 0          0 
> eth1
>   U         0 0          0 
> xenbr0
>     U         0 0          0 
> eth1
>       U         0 0          0 
> The virtual interfaces are configured like this in the domU configuration 
> file:
> vif=[ 'mac=00:16:3e:6a:64:07,bridge=xenbr0', ]
> do I need to do any additional network configuration to allow 
> from domU do dom0?
> Any more information I should provide?

As a workaround I created a native bridge, with just my physical interface 
as a device, and then I reconfigured the xen domU's to bind to that bridge, 
instead of the xenbr0, and it works like a charm, but I doubt that it is the 
way it should work. That works for me, and I am fine with that, but if 
anybody has a hint on how to do it with using xenbr0, please let me know.

kind regards

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