> > How about having a domU that does the iptables stuff and all the
> > "application" domUs live in rfc1918 space?
>> 2a though, at best, and it was considered.
>> > The "virtual router" domU could be identical on both sites if it
> > had some smart way of figuring out where it was running. For
> > example, ping the
> > upstream router IP address for both providers and see which has
> > the lower TTL.
>> Yeah, or have its IP passed to it at boot time - that's a solvable
> problem, but it's debatable what having that domU brings you, as
> against having iptables run on the dom0.
Your iptables-running domU is replicated between sites, same as the
application domUs. That way any iptables config only needs to be
done in one place. Running iptables on the dom0s means that you
have to configure it in two places.
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