Re: [Xen-users] Force traffic out one interface

[Jonathan Tripathy <jonnyt@xxxxxxxxxxx>]

On 13/06/10 17:02, Fajar A. Nugraha wrote:
> On Sun, Jun 13, 2010 at 10:45 PM, Jonathan Tripathy<jonnyt@xxxxxxxxxxx>  wrote:
>    
> > Hi Everyone,
> >
> > Does anyone know any rules that I could use (using iptable, ebtables, or
> > otherwise) that could force all traffic coming from a guest to go out via a
> > particular interface? I wish to stop "inter-guest" communication, without
> > going via my firewall first.
> >      
> IIRC Xen bridged networking by default passes domU traffic through the
> bridge on dom0 (even for inter-guest communications). Try setting up
> some rules there (i.e. make dom0 your firewall).
>
> If you want to use an external firewall (not in dom0), then no, I
> don't know of any way to do that.
>
>    
Hi Fajar,

I'm pretty sure that by using ebtables (in the Dom0) at the "link 
layer", I can force all traffic out via one interface. I believe that a 
"linux-bridge" acts just like a stupid "Hub" (Ah remember those days 
before switches were common?!). So by only allowing traffic out via the 
interface which is connected to the firewall, traffic if forced to go 
out that way.
Of course, this is just theory, so I'm asking here as someone else may 
have some experience.
My backup plan, as you rightfully mention, is to just do the firewalling 
in the Dom0 itself. I'd just like to use a single external firewall for 
easy management.
Thanks

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