> Option 1.  Get passive eavesdropping protection deployed ASAP.  If
> better protection against TCP attacks is needed, it can be done
> separately as an enhancement without holding back what is needed now
> which is deployable passive eavesdropping protection.

+1

Keep in mind the KISS principle

I think the TCP header is an orthogonal issue that can and should be solved 
separately. TCPM currently discusses hashing/MAC of headers/options fields for 
other purposes (e.g., middleboxes breaking EDO). If we need a MAC of header 
fields in TCP connections not using tcpinc, we should define *one* generic and 
modular solution for all TCP usage scenarios (on STD track) and not a 
tcpinc-specific MAC. Otherwise, I would be really concerned about 
interoperability between multiple TCP extensions calculating some form of MACs 
in their own way. In short, this looks to me like a separate RFC.

As a side note, this design choice really correlates with the question whether 
tcpinc runs an own framing in the payload.

Michael

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