Subject: Re: [quicwg/base-drafts] Don't change CID on peer CID change (#2145)
From: Mike Bishop <[email-masked]>
To: quicwg/base-drafts <[email-masked]>
Cc: Subscribed <[email-masked]>
Date: Thu, 13 Dec 2018 12:21:59 -0800
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>

IIRC, @ekr is correct; we agreed to do this on peer address change.

- If you don't know you've been rebound and you reuse a CID, you've already linked yourself; the peer changing CID in response is pointless.
- If you either anticipate a rebinding or proactively change ports, and change both CID and address simultaneously, then it doesn't matter which of those triggers the peer to switch.
- If you switch CID without changing address, the address links you with fairly high probability anyway, so it doesn't really matter if the peer switches.

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