[NSIS] Review of GIST over SCTP and DTLS - updated
Elwyn Davies <elwynd@dial.pipex.com> Wed, 10 February 2010 20:07 UTC
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Date: Wed, 10 Feb 2010 20:10:40 +0000
From: Elwyn Davies <elwynd@dial.pipex.com>
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Cc: Xiaoming Fu <fu@cs.uni-goettingen.de>
Subject: [NSIS] Review of GIST over SCTP and DTLS - updated
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Hi. Sorry this is bit late. I reviewed draft-ietf-nsis-ntlp-sctp-07. I forgot that Jukka requested views on the value of the work and reasons for further work. I would say that SCTP could well have value in the early deployment situation. If NSIS nodes were only available at the edge of enterprise networks, an SCTP connection between two such boxes across the backbone might be interesting. The multi-path, multohoming support would then give reliability and help with providing alternative routes that might not be otherwise discovered. The advantages of SCTP in a more dense network of NSIS nodes is to my mnd a bit dubious, but if there is a lot of traffic the streaming stuff and the multiple connections could well be hlpful. I am not sure how much SCTP has been deployed in general purpose machines. If SCTP deployment is not going places, I'm afraid that adding NSIS is not really going to be the killer app that drives increased SCTP deployment. In this case the work needed to finish this may be of not much value. On the other hand, there doesn't seem to be a lot of work needed to get the draft ready. Comments: Header: I guess this has to be experimental now. Minor Issues: s2, next to last para: I don't think you can claim 'no changes to GIST'. The addition of SCTP and DTLS inevitably adds code to GIST, and some changes to the API are envisaged also. one might say: The methods of using an unchanged SCTP with GIST described in this document do not require any changes to the high level operation and structure of GIST. Addition of the new transport options require additional interface code and configuration support to allow applications to exploit the additional transport when appropriate. s3.1.2: As with other SCTP applications, part of the point of SCTP is to conceal from the higher level application that a particular connection has died. SCTP should or might be able to keep roght on running using other address pairs even if one link dies. One shoudl be clear here just what sort of error is going to be reflected back to the NSLP. I am not sure what the socket interface for SCTP does in various citcumstances as I have never has the opportunity to make use of one. s5.1: Maybe one should discuss the meaning of path coupled in the face of multipath routing! Editorial: s1, para 2: > Furthermore, this document shows how GIST > SHOULD be used to provide the additional features offered by SCTP to > deliver the GIST C-mode messages This doesn't sound quite right. As with the point (in minor issues) about s1 (next to last para), GIST *does* have to be expanded to support SCTP and DTLS. and you are documenting how to use GIST when it has SCTP/DTLS support, so Furthermore, this document descibes how GIST should be interfaced to SCTP and used by NSLPs in order to exploit the additional capabilties offered by SCTP to deliver GIST C-mode messages more effectively. s1, last para: Do we describe SCTP as a datagram transport protocol? I thought it was more sequenced packet, but I may be wrong. s2: Do we actually need to copy the definitions of MRM. MRI, MRS and SCD? s2, definition of SCTP Assocation: s/identified by the transport addresses/identified by the set of transport addresses/ s3.1.1: Maybe mention that these go into the Stack Configuration Data. s3.2, para 2: s/bi-direction/bi-directional/ s3.3, para 1: s/partial relaible messages/partially reliable messages/ s3.3, para 2: s/In a standard SCTP../With standard basic SCTP[2]../ s5.2: s/as transport GIST/as transport for GIST/ s11.2 [9] The extensibility draft file name has changed. _______________________________________________ nsis mailing list nsis@ietf.org https://www.ietf.org/mailman/listinfo/nsis
- [NSIS] Review of GIST over SCTP and DTLS - updated Elwyn Davies
- Re: [NSIS] Review of GIST over SCTP and DTLS - up… Xiaoming Fu
- Re: [NSIS] Review of GIST over SCTP and DTLS - up… Xiaoming Fu
- Re: [NSIS] Review of GIST over SCTP and DTLS - up… Jukka Manner
- Re: [NSIS] Review of GIST over SCTP and DTLS - up… Xiaoming Fu
- Re: [NSIS] Review of GIST over SCTP and DTLS - up… Jukka Manner
- Re: [NSIS] Review of GIST over SCTP and DTLS - up… Xiaoming Fu
- Re: [NSIS] Review of GIST over SCTP and DTLS - up… Jukka Manner