Re: [multipathtcp] Options or Payload?
Joe Touch <touch@ISI.EDU> Tue, 10 November 2009 01:55 UTC
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Date: Mon, 09 Nov 2009 17:54:33 -0800
From: Joe Touch <touch@ISI.EDU>
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To: Yoshifumi Nishida <nishida@sfc.wide.ad.jp>
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Cc: multipathtcp@ietf.org
Subject: Re: [multipathtcp] Options or Payload?
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 This has been tried in various places in TCP to extend the options space. It'd be useful to take a look at that work as context. Joe Yoshifumi Nishida wrote: > Hello, > How about having a simple option which indicates the offset for real tcp payload? > For example, if mptcp packets conveys 10 bytes control info in the payload, set > offset to 10 in the option. > > Thanks, > -- > Yoshifumi Nishida > nishida@sfc.wide.ad.jp > > From: "Ford, Alan" <alan.ford@roke.co.uk> > Subject: [multipathtcp] Options or Payload? > Date: Tue, 10 Nov 2009 00:58:48 -0000 > Message-ID: <2181C5F19DD0254692452BFF3EAF1D6808D7BB51@rsys005a.comm.ad.roke.co.uk> > > > Hi all, > > > > One of the big issues to be raised during yesterday's MPTCP session was > > the question of whether TCP Options are really the right place to be > > doing this. This is not the first time this has come up but deserves > > further exploration. > > > > Specifically, instead of doing this with TCP Options, the same > > instructions could be included in the payload. Similar to TLS, the data > > could be chunked and each chunk has a data sequence and length header. > > These can be interspersed with control blocks to signal addresses, > > security of joining subflows to connections, and connection close. A > > simple 2-octet TCP option would still be used in the initial SYN to > > signal MPTCP capability. > > > > This has the benefit that it would allow the signalling to have > > reliability, and we wouldn't be hit with option space limits, and thus > > be potentially able to do better security algorithms. It would also give > > us greater freedom in signals for future extensibility (for example, if > > we wanted to signal ports for additional subflows, not just addresses). > > > > On the downside, there may be cases where this could confuse > > middleboxes, e.g. expecting HTTP on port 80 and finding this kind of > > data instead. However, since a TCP option would be used at the start to > > identify capability, if this were dropped by a middlebox/proxy then > > MPTCP would not be used. > > > > What do people think is the best approach? > > > > Regards, > > Alan > > > > _______________________________________________ > > multipathtcp mailing list > > multipathtcp@ietf.org > > https://www.ietf.org/mailman/listinfo/multipathtcp > _______________________________________________ > multipathtcp mailing list > multipathtcp@ietf.org > https://www.ietf.org/mailman/listinfo/multipathtcp -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) iEYEARECAAYFAkr4x9kACgkQE5f5cImnZrvWAwCghDjI91tfGfNVoizvAD7u8CA1 DF0AoJa7A4tFzxvsrjYKiVRIJIuF96CD =dJcd -----END PGP SIGNATURE-----
- [multipathtcp] Options or Payload? Ford, Alan
- Re: [multipathtcp] Options or Payload? Yoshifumi Nishida
- Re: [multipathtcp] Options or Payload? Ford, Alan
- Re: [multipathtcp] Options or Payload? Joe Touch
- Re: [multipathtcp] Options or Payload? William Herrin
- Re: [multipathtcp] Options or Payload? SCHARF, Michael
- Re: [multipathtcp] Options or Payload? Joe Touch
- [multipathtcp] Options or Payload: pros and cons Costin Raiciu
- Re: [multipathtcp] Options or Payload: pros and c… SCHARF, Michael
- Re: [multipathtcp] Options or Payload: pros and c… Costin Raiciu
- Re: [multipathtcp] Options or Payload: pros and c… Costin Raiciu