Re: [tcpm] Faster application handshakes with SYN/ACK payloads
Joe Touch <touch@ISI.EDU> Sun, 21 September 2008 06:38 UTC
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Date: Sat, 20 Sep 2008 23:38:07 -0700
From: Joe Touch <touch@ISI.EDU>
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Cc: Adam Langley <agl@imperialviolet.org>, tcpm@ietf.org, Stefanos Harhalakis <v13@v13.gr>
Subject: Re: [tcpm] Faster application handshakes with SYN/ACK payloads
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Stefanos, Here's a more brief, self-contained reply: Joe Touch wrote: > Hi, Stefanos, > > Stefanos Harhalakis wrote: >> Hello Adam, > ... >> I believe that this was not proposed before so here it goes: > >> Add a generic 'user data' option for SYN fields that would carry user data. There are two reasons for doing this: 1- to send an out-of-band signal 2- to send a signal that the server acts on before the handshake completes #2 violates TCP semantics, so the SYN-ACK cannot have application data that depends on the SYN's user data option (which is the desired result here). The signal can't be acted on at the application layer until the handshake completes. #1 changes TCP semantics as well, since TCP does not have an out-of-band signal path, and this would add that. However, because it cannot be acted on until after the handshake completes, it cannot modify application behavior that isn't required to wait until the handshake finishes - i.e., apps that can write to the socket before the handshake completes (e.g., to write data available to a SYN-ACK) would never change because of this signal. The utility of this feature depends on application behavior, which cannot be known, and thus cannot be relied upon. As a result, I cannot see how this feature can be used to extend TCP. Joe -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkjV684ACgkQE5f5cImnZrubhACbBf4fbf2No0G1LfwUikcLg6+w njoAn3a9wBkWD5ijcseuD2w/9I3lPyhv =IjGv -----END PGP SIGNATURE----- _______________________________________________ tcpm mailing list tcpm@ietf.org https://www.ietf.org/mailman/listinfo/tcpm
- [tcpm] Faster application handshakes with SYN/ACK… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Lloyd Wood
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Michael Scharf
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- [tcpm] Faster application handshakes with SYN/ACK… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Murali Bashyam
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Matt Mathis
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Anantha Ramaiah (ananth)
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Stefanos Harhalakis
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Stefanos Harhalakis
- Re: [tcpm] Faster application handshakes with SYN… Adam Langley
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch
- Re: [tcpm] Faster application handshakes with SYN… Stefanos Harhalakis
- Re: [tcpm] Faster application handshakes with SYN… Stefanos Harhalakis
- Re: [tcpm] Faster application handshakes with SYN… Joe Touch