Force traffic

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Hi Everyone,

Does anyone know any rules that I could use (using iptable, ebtables, or otherwise) that could force all traffic coming from an interface to go out via a particular interface? I'm using Xen and all the DomUs ("VMs" or "Guests") are connected to a linux bridge. I wish to force all traffic from these VMs to go out via the interface which is connected to my firewall (which itself is a filtering bridge). I wish to do this all at the "link-layer" if possible.

I am lead to believe that in a linux bridge, all frames are sent to all ports (a bit like the old-school hubs), so it could just be a matter of blocking all traffic, except those which are for the firewall interface, using ebtables.

Any help is very much appreciated.

Thanks

Jonathan
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