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Re: [quicwg/base-drafts] RTT Measurement for HelloRetryRequest (#879)

Ryan Hamilton <notifications@github.com> Tue, 17 October 2017 06:14 UTC

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Date: Tue, 17 Oct 2017 06:14:15 +0000
From: Ryan Hamilton <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+0166e4ab94d8741475b5968a0bc1b2f646af49b4004fd90892cf0000000115fd61b792a169ce0fdaa9cd@reply.github.com>
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Subject: Re: [quicwg/base-drafts] RTT Measurement for HelloRetryRequest (#879)
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It's possible for a client to underestimate the RTT to the server, send a ClientHello and then retransmit it. The server could receive the first ClientHello and send a HelloRetryRequest in response. But at this point the client may think that the HelloRetryRequest is in response to the second retransmitted ClientHello. So by sending an ACK, the client can learn if ClientHello 1 or 2 was the packet which elicited the HelloRetryRequest.

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