bridging and NAT?

bridging and NAT?

[Robert Edmonds]

I am not too familiar with Xen and the art of packet mangling, but is it
possible to have the same physical network interface (eth0) function as
a bridged adapter for unpriviledged Xen domains and as the internal NAT
interface for a LAN? When I start xend, it seems my NAT configuration is
hosed, as I cannot even ping the Domain-0 eth0 from my LAN. Can I
perhaps circumvent this side-effect by bridging to an interface alias or
a dummy interface?

-- 
Robert Edmonds


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RE: bridging and NAT?

[Ian Pratt]

> I am not too familiar with Xen and the art of packet 
> mangling, but is it possible to have the same physical 
> network interface (eth0) function as a bridged adapter for 
> unpriviledged Xen domains and as the internal NAT interface 
> for a LAN? When I start xend, it seems my NAT configuration 
> is hosed, as I cannot even ping the Domain-0 eth0 from my 
> LAN. Can I perhaps circumvent this side-effect by bridging to 
> an interface alias or a dummy interface?

Should be possible, though I suspect you'll have to use your own custom
equivalent of the /etc/xen/scripts/network script. (You can control this
from xend-config.sxp)

You should probably create the bridge and eth0 before configuring the
iptables rules to set up the NAT.

Ian


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