Xen security / MAC hijack

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Hi,


I'm trying to prevent the follow scenario:

Xen host 1 has a hwaddr.

Xen host 2 steels hwaddr of host 1.


At that moment Xen host 1 is not reachable anymore.


Now I tried to prevent ARP packets in the forwarding chain that didn't
match the mac that Xen reports as valid. But it seems the bridge get
informed about this 'new interface' upon ifconfig eth0 up in an other
way, or via an other route.


Is it possible to limit a source mac to a specific interface in a way
that also ARP replies are blocked that indicate other macs?




Stefan
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