Re: [Xen-users] Xen and routing

[James Bulpin <james@xxxxxxxxxxxxx>]

On Wed, 2005-05-18 at 20:52, Eric E wrote:
> Hi James,
>     Sorry - for some reason I missed this message until now...  I've 
> reconfigured eth0 in dom1 without specifying a hardware module.  It 
> comes up, but still no access into or out of the network...
[...]

Something fishy is going on with your dom1 MAC address:

> dom0:/ # ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:11:85:F4:87:76

> dom1:/ # ifconfig
> 
> eth0      Link encap:Ethernet  HWaddr 00:11:85:F4:87:76

i.e. both dom0 and dom1 have the same MAC address. This doesn't play
well with the bridge or with ARP. Are you specifying that MAC in your
dom1 config file? If so, use another (just commenting out vif= should be
fine). Domains in a bridged configuration need to have different MAC
addresses in the same way that physical machines would do. 

> --------------------------------------------------------------------------------------------------------------------------------
> dom0:/# brctl show
> bridge name     bridge id               STP enabled     interfaces
> xen-br0         8000.001185f48776       no              eth0
>                                                         vif7.0
> --------------------------------------------------------------------------------------------------------------------------------
> dom0:/# brctl showmacs xen-br0
> port no mac addr                is local?       ageing timer
>   1     00:08:02:96:ee:f1       no                33.65
>   1     00:0d:56:e7:9e:cc       no               235.29
>   1     00:11:85:7d:39:af       no                 8.98
>   1     00:11:85:7e:51:eb       no               113.87
>   1     00:11:85:ee:79:f4       no                 0.00
>   1     00:11:85:f2:54:4a       no               290.09
>   1     00:11:85:f2:55:be       no                46.89
>   1     00:11:85:f4:87:76       yes                0.00
>   1     00:c0:9f:46:e4:1b       no               128.81
>   1     00:e0:4c:ae:e6:07       no                17.76
>   2     fe:ff:ff:ff:ff:ff       yes                0.00

Note here that no actual address appears on the bridge port #2. 

James


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