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Re: [quicwg/base-drafts] First byte changes (#2006)

Igor Lubashev <notifications@github.com> Mon, 19 November 2018 16:33 UTC

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Subject: Re: [quicwg/base-drafts] First byte changes (#2006)
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igorlord commented on this pull request.



>  
-: The fourth bit (0x10) of byte 0 is set to 1.
+: The next two bits (those with a mask of 0x18) of byte 0 are reserved.  These
+  bits are protected using header protection (see Section 5.4 of
+  {{QUIC-TLS}}).  The value included prior to protection MUST be set to 0.  An

What important purpose is served by requiring the value of these bits to be 0?  This precludes the use of these bits for experimental purposes, like VEC and LOSS detection.

Before the use of these bits is standardized, the risk of middleboxes ossifying occasional experimental use of the bits seems less significant than the loss of opportunity to experiment.

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