Re: [Doh] [dnssd] [DNSOP] Working Group Last Call - draft-ietf-dnsop-session-signal

Stuart Cheshire <cheshire@apple.com> Wed, 21 February 2018 18:39 UTC

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From: Stuart Cheshire <cheshire@apple.com>
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Date: Wed, 21 Feb 2018 10:39:15 -0800
References: <CADyWQ+GsU9dL8D58Eko0w9mVRMMTZ7f9NQKx3a0XS7oUGHjniQ@mail.gmail.com> <91E3DCED-7A40-4454-9809-EBF68E942DB0@vpnc.org> <02FF7C21-3421-40C5-A530-BE1D814237B2@cisco.com> <976312C8-4424-4642-A150-21F25FB137EE@fugue.com> <5AFBBFBE-CF5A-4F7A-9AC9-F7E0040BBABD@cisco.com>
To: "Jan Komissar (jkomissa)" <jkomissa@cisco.com>, Ted Lemon <mellon@fugue.com>, "dnssd@ietf.org" <dnssd@ietf.org>, dnsop <dnsop@ietf.org>, "doh@ietf.org" <doh@ietf.org>, Paul Hoffman <paul.hoffman@vpnc.org>
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Subject: Re: [Doh] [dnssd] [DNSOP] Working Group Last Call - draft-ietf-dnsop-session-signal
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I think Jan makes a good point.

Suppose there’s a server that supports DNS over TCP, and DSO signaling, and Push Notifications, and DNS Update, and maybe other things.

Now suppose a client connects to that server. The server doesn’t know what that client is going to do. The client may do queries over TCP, or DNS updates. It may do queries over TCP and use the DSO signaling to request a longer inactivity timeout. It may request Push Notifications (which are currently specified to require TLS). It may do all of those.

When the server receives an incoming TCP connection request from a client, what are the first bytes received over that TCP connection? Are they a DNS header and message body? Are they a TLS handshake message? Can it be either? How does the server know?

Stuart Cheshire