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Re: [Xen-devel] Re: nfsroot and brige

On Thu, 13 Jan 2005, Grzegorz Milos wrote:

> Instead use routing and iptables (masquerade) as follows:
> dom0 eth0 stays with
> dom0 eth1 stays with
> dom0 acts as a NAT for unpriviledged domains

that's what I was kind of figuring I would need to do. 

But a real bridge (I used to use them) would transparently bridge packets 
from vif1.0 to eth1, right? This is what I never saw working, unless I did 
things that made no sense (e.g. ifconfig xen-br0, and even 
then I only got from domU to dom0. (it makes no real sense to me for a 
*bridge* to have an IP address).

I would expect something working as a real bridge to allow me to do this:

ifconfig eth1
brctl  xen-br0 addif eth1
brctl  xen-br0 addif vif1.0

This is essentially wiring the two ifs up to xen-br0. 

then I dhcp from domU and I would think packets ought to flow to 
vif1.0->eth1, and eth1->vif1.0, broadcasts would flow across the bridge 
transparently and, once the right MAC discovery happened, packets from 
vif1.0 would make it to

I'm still not sure they didn't -- tcpdump seemed to think the DHCP 
requests were going to eth1, but my home router didn't seem to think it 
was seeing them. I will do a little more fooling around. 


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