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GIST over SCTP: Extending GIST to Support Stream Control Transmission Protocol

This draft proposes extending the GIST protocol to support SCTP as a transport mechanism. It discusses the necessary changes to GIST and outlines the implementation status, open issues, and next steps.

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GIST over SCTP: Extending GIST to Support Stream Control Transmission Protocol

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  1. GIST over SCTP<draft-fu-nsis-ntlp-sctp-00.txt> Xiaoming Fu Christian Dickmann Jon Crowcroft

  2. Overview • Motivation • GIST over SCTP • Implementation status • Open issues • Next steps

  3. Motivation • Current NTLP/GIST spec defines a flexible transport framework which (theoretically) allows any type of transport mechanism • Currently only support UDP, TCP and recently TLS over TCP • SCTP initially defined as a signaling transport protocol possesses many properties required by signaling transport • It should be possible to extend GIST to support SCTP as transport • GIST over SCTP: • Describes the considerations of extending GIST to support • Basic SCTP features: stream-based, multi-homing, etc • Considerations for partial reliability, TLS over SCTP

  4. GIST Protocol Negotiation Overview (per GIST draft) Querying Node Responding Node • Stack-Proposal: sequence of Profiles • Profile: stack of Protocol-Layers • Protocol-Layer: protocol name and security / stack-configuration-data • Add new setup mechanisms by defining new protocol-layers GIST-Query: Stack-Proposal-Q(fixed for interface and NSLPID)Node-Addressing-Information(parameters for possible protocols) GIST-Response: Stack-Proposal-R(fixed for interface and NSLPID)Node-Addressing-Information’(updated object from query) GIST-Confirm (in C-mode): Stack-Proposal-R (echoed)

  5. GIST over SCTP GIST stack proposal and its negotiation: • Add “SCTP” as a new transport protocol ID • Define Stack-Configuration-Data for “SCTP” • Suggest rules to support multi-homing, PR-SCTP, TLS/SCTP This proposal mainly discusses the necessary changes to GIST in order to use SCPT as transport. • Potentially, access router discovery can be also based on GIST

  6. Implementation status • All basic SCTP support: implemented in GIST release 0.2.0 • ~TCP, with an exception when session number becomes very huge (40k) • SCTP expert told me this can be due to the Linux SCTP implementation • PR-SCTP and TLS/SCTP support: TBD

  7. Open Issues • How to exactly support multi-homing • Host multihoming is easy • Per neighbor-pair multihoming needs further study

  8. Next Steps • Is this work useful? • Should it be accepted as a WG item?

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