use iptables rules in the FORWARD chain (beware undesirable
interactions with bridged IP traffic through bridge-nf if enabled vith
sysctl net.bridge.bridge-nf-call-iptables=1).
I think I'm doing that anyway. For every VM that is started, a strict
set of iptables rules are set up which only allow traffic in/out of
specific interfaces (using physdev). The rules also prevent ip spoofing.
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