[quicwg/base-drafts] active_connection_id_limit defaults to 0 (#3197)

Mike Bishop <notifications@github.com> Wed, 06 November 2019 19:41 UTC

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Date: Wed, 06 Nov 2019 11:41:09 -0800
From: Mike Bishop <notifications@github.com>
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Subject: [quicwg/base-drafts] active_connection_id_limit defaults to 0 (#3197)
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The implication, of course, is that 0 => infinite, but we don't actually say that anywhere.  (This part might be editorial; it omits to say what we all know it means.)

1 is also a mostly-invalid value, since you can't avoid exceeding that limit without the peer dropping to zero CIDs in the interim and therefore stalling the connection for an RTT + any recovery time needed.

This is fine, really, so long as the peer SHOULD NOT exceed the limit; if you send (or default to) a stupid value, the peer will ignore you and all is well.  But if we take #3193's suggestion that exceeding the limit be a MUST NOT, the default needs to be infinite and values less than 2 need to be prohibited.

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