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MPTCP Protocol draft-ietf-mptcp-multiaddressed-07

Updated MPTCP protocol draft incorporating Fast Close mechanism for instant subflow state termination. Includes clarifications on retransmissions, checksum negotiation, and fallback mechanisms.

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MPTCP Protocol draft-ietf-mptcp-multiaddressed-07

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  1. MPTCP Protocoldraft-ietf-mptcp-multiaddressed-07 Alan Ford alanford@cisco.com

  2. WGLC Complete • Thanks to Christoph Paasch for detailed comments and discussion

  3. Recent Technical Changes • -03 to -04: added path ID to MP_PRIO • -05 to -06: added Fast Close (MP_FASTCLOSE) mechanism

  4. Fast Close Mechanism • Derived from long-running discussion with Georg Hampel, started in Quebec • Analogous to (ab)use of TCP RST as ‘Fast Close’ • i.e. allow instant drop of state for all subflows • Says “no more data will be accepted for this subflow” • Mechanism: • Host A sends ACK+MP_FASTCLOSE on one subflow, and RST on remainder • Host B responds with RST on subflow • Upon receipt of RST in this situation, or of another MP_FASTCLOSE, Host A tears down state • Host A SHOULD retransmit MP_FASTCLOSE if not RST is received in one RTO

  5. Various Clarifications • Notably: • Clarified retransmissions and ACK mechanism for MP_CAPABLE and MP_JOIN exchanges • Revert to TCP three-way-handshake • Reverted changes of presence of keys • Clarified when to send data on new subflows • Clarified negotiation of checksums • Clarified rationale for DATA_ACK • Clarified fallback mechanisms: rationale and scenarios

  6. Next steps…

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