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Re: [TLS] Is stateless HelloRetryRequest worthwhile? (was Re: TLS 1.3 Problem?)

"Salz, Rich" <rsalz@akamai.com> Wed, 30 September 2020 18:20 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Michael D'Errico <mike-list@pobox.com>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] Is stateless HelloRetryRequest worthwhile? (was Re: TLS 1.3 Problem?)
Thread-Index: AQHWl04eVIjhR8YP4E6fdJIP6UMv6qmBsm+AgAALhAD//8BGgA==
Date: Wed, 30 Sep 2020 18:20:50 +0000
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Subject: Re: [TLS] Is stateless HelloRetryRequest worthwhile? (was Re: TLS 1.3 Problem?)
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>    This makes sense since DTLS is over UDP, but TLS
    is over TCP, so it's already undergone the SYN/ACK
    handshake to establish there's an actual peer with
    a reachable address.

Not always; see TCP "fast open" options.

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