NAT traversal
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... destination port 500
and possibly also port 4500 if NAT traversal is used.
The packet format ...
... destination port 500 and possibly also
port 4500 if NAT traversal is used.
The IDci and IDcr payloads ...
... B.2. NAT Traversal and Mobility ...
... tunneling mechanisms.
2. Using NAT traversal allows the outer address to change without
having to renegotiate the SAs ...
