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Re: [quicwg/base-drafts] Required state for retaining unacked RETIRE_CONNECTION_ID frames is unbound (#3509)

Kazuho Oku <notifications@github.com> Wed, 11 March 2020 03:50 UTC

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Date: Tue, 10 Mar 2020 20:50:54 -0700
From: Kazuho Oku <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Required state for retaining unacked RETIRE_CONNECTION_ID frames is unbound (#3509)
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@martinthomson 
> Mathematically, this might be unbounded, but it's more likely that in practice the limit is `2*active_connection_id_limit` as it would be unlikely that unacknowledged RETIRE_CONNECTION_ID frames would remain so once more NEW_CONNECTION_ID frames start arriving. More so as the issuer of those NEW_CONNECTION_ID frames has to have received the RETIRE_CONNECTION_ID frames.

I think `2*active_connection_id_limit` is fine, assuming that the endpoint would just stop retransmitting oldest RETIRE_CONNECTION_ID frames. That limit would be too stern to be used for detecting potential attacks (and therefore closing the connection with CONNECTION_VIOLATION).

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