> 2- I'm till ill at ease will the fact that NAT-PT is till > the only solution mentioned even if that solution is none > to be not enough efficient. Is IETF allowed to propose 3GPP > other solutions ? => Sure. How to do that ? => You have to have a solution first :) There were several discussions about taking the ALG out of NAT-PT, but we don't have a WG doc. Hesham