Re: [multipathtcp] Options or Payload?
Joe Touch <touch@ISI.EDU> Tue, 10 November 2009 03:03 UTC
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Date: Mon, 09 Nov 2009 19:04:08 -0800
From: Joe Touch <touch@ISI.EDU>
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To: "Ford, Alan" <alan.ford@roke.co.uk>
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Cc: multipathtcp@ietf.org
Subject: Re: [multipathtcp] Options or Payload?
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Ford, Alan wrote: > We had considered that, however the main reason against this was whether > certain middleboxes would split and coalesce TCP payloads thus breaking > the placement of the extended options - the TCP payload is essentially > no longer a continuous stream. > > Wes Eddy proposed a "Long Options Option" > (http://tools.ietf.org/id/draft-eddy-tcp-loo-04.txt) which seemed to be > a possible way of doing a very similar thing, by negotiating to ensure > that long options would work along a path. Although, this draft is now > expired, and I'm not sure why it was dropped. Anyone know? Same problems. Joe >> -----Original Message----- >> From: Yoshifumi Nishida [mailto:nishida@sfc.wide.ad.jp] >> Sent: 10 November 2009 01:35 >> To: Ford, Alan >> Cc: multipathtcp@ietf.org >> Subject: Re: [multipathtcp] Options or Payload? >> >> >> 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) iEYEARECAAYFAkr42CgACgkQE5f5cImnZrsyRwCg89PYtNKtA6LsK2vEGFB9sXJy NMwAmQHJ5C8MkXkTQqFdAurtj4ayeKBA =IEs8 -----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