On Wed, Jul 01, 2009 at 05:50:18AM +0200, Jan Engelhardt wrote:
quoted text
> 
> On secondary thought, one could also argue that because conntrack 
> ignores the interface, two unrelated connections happening to be routed 
> through the same machine(*) are tracked as one, too.

Good point.  We really should make these risks much more explicit.

However, I still think the risk with bridging is higher, especially
in the presence of virtualisation.  Consider the scenario where you
have to VMs on the one host, each with a dedicated bridge with the
intention that neither should know anything about the other's
traffic.

With conntrack running as part of bridging, the traffic can now
cross over which is a serious security hole.

Cheers,
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