> PS (1): the idea is to send a magic packet to the destination
> at the known port. If only the source is natted then the peer
> address and port will be available in the encapsulated stuff.
I've observed that, even if there is traffic every few seconds,
the NAT box I have will change the UDP source port occasionally
for UDP traffic.
Thus it isn't sufficient to send the magic packet once.
Erik
PS. The above is based on operational experience for IPv4 over UDP/IPv4
to enable IPsec tunnels on top of that.
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