design draft issue: nat-p

>   This gives extra
>    protection against 3rd party bombing attacks (the attacker cannot
>    divert the traffic to some 3rd party). 


This seems inaccurate, or at least too strong. We have
other mechanisms to prevent that, and the NAT-T based
attack only works for on-path attackers. Just say
"This avoids any possibility of on-path attackers modifying
addresses in headers" and refer to Francis's pseudonat
attack draft.

--Jari