Re: [quicwg/base-drafts] PMTUD details (#614)

[martinduke <[e-mail]>]

I had another look at my RFC4821 notes. Here are some observations:
- In my opinion, someone familiar with other aspects of QUIC can read RFC 4821 and implement PLPMTUD with no more difficulty than they would with TCP or SCTP. So strictly speaking, no additional text in the QUIC spec is necessary.
- Section 6 discusses necessary protocol properties, and QUIC has them. Section 6 specifically mentions padding as a nice-to-have. PR #849, in its current state, makes this explicit.
- It would be possible to state explictly that search_low (7.2) should be the IPv6 minimum packet size, as that is the minimum size in QUIC. However, I personally find this redundant.
- It is possible to recommend an aggressive probe sizing strategy (7.3) since QUIC probe retransmissions are unnecessary. Again, I find this redundant.

I believe the current PR adequately cues the reader on relevant considerations without laboriously repeating RFC 4821. I am also persuadable that the original text is fine and the PR is unnecessary. However, I am interested if others find the current language, in conjunction with 4821, to be insufficient, and if so what pieces are ambiguous.

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