Hello,

Re: Part of RFC 5996 Sec 1.2 that talks about DH retry in the case initiator 
guesses the wrong DH group in SA INIT

It's not clear to me whether the expectation is for the second  SA INIT attempt 
(this time with the DH group hinted at by peer) can start afresh with a new IKE 
cookie pair (message ID 1)
OR
If it must retain the existing cookie pair (message ID 2)

AFAICT either way is acceptable since both achieve the same end. The former 
seems slightly easier.
Pls correct me though if one approach is strictly the right way. If so then why.

Thanks
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