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ESP/AH tunnel mode= ESP/AH transport mode(IP in IP tunnel mode)?



Hi,
In Linux FreeS/WAN project, they implement the ESP/AH tunnel mode like
this:
1. to encapsulate the orginal IP packet in IP-in-IP mode;
2. to apply ESP/AH transport on the encapsulated IP packet.
that is:
ESP/AH tunnel mode= ESP/AH transport mode(IP in IP tunnel mode)
Is this right?

Thanks,
Chen L.



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