I was tasked in IETF-85 to find out why mss rewrite was removed before publishing RFC6333. Here is my finding:
Back in 2009-4-7, people in ML reported rewriting MSS would break TCP-AO if TCP option flag set to 0. In IETF-75, Dave Thaler suggested to delete mss rewrite from the draft. The argument was MTU is a generic issue for all tunneling techniques, a separate draft should be written to address it rather than including mss rewrite in a particular draft. Alain asked the WG the question "Whether to remove fragmentation/mss discussion from the document or to keep it". Dave Ward suggested to remove it. Discussion could be found in IETF-75 minute: http://ietf.10.n7.nabble.com/Softwires-WG-meeting-Notes-td112138.html
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