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Re: RFC 2401 section 5.2.1



>Transport mode does not solve the end-to-end security problem.
>In fact, either mode of IPSec cannot traverse NAT and is not
>capable of providing end-to-end security. One exception is the
>LAN configuration where you do not have to deal with NAT. There,
>one can use the transport mode for end-to-end security. A whole
>lot of work has been done to address this problem, e.g. RSIP,
>UDP encapsulation etc.

	say a long goodbye to NAT, use IPv6.

itojun


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