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Possible extensions
The basic idea is for the node moving behind NAT to learn that it moved behind NAT and also learn the NAT bindings.
STUN (rfc 3489) already used by other applications for learning the NAT bindings.
IKE can use STUN directly or indirectly to learn the information.
STUN has built in mechanism to secure the NAT binding information.
This can work across NAPT and NAT including multiple of them.

PPT Version