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Xen 3.0 Virtualization User Guide
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9.2.3 Nodes on an Untrusted Subnet

Migration on an untrusted subnet is not safe in current versions of Xen. It may be possible to perform migrations through a secure tunnel via an VPN or SSH. The only safe option in the absence of a secure tunnel is to disable migration completely. The easiest way to do this is with iptables:

# this command disables all access to the Xen relocation port
iptables -A INPUT -p tcp -{}-destination-port 8002 -j REJECT
Xen 3.0 Virtualization User Guide
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