[multipathtcp] [Technical Errata Reported] RFC8684 (6609)
RFC Errata System <rfc-editor@rfc-editor.org> Mon, 14 June 2021 17:52 UTC
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Subject: [multipathtcp] [Technical Errata Reported] RFC8684 (6609)
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The following errata report has been submitted for RFC8684, "TCP Extensions for Multipath Operation with Multiple Addresses". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid6609 -------------------------------------- Type: Technical Reported by: Krishna Khanal <erkrishna.khanal@gmail.com> Section: B.3 Original Text ------------- initiator listener | | | S 0(20) <MP_CAPABLE>, <TFO cookie> | | --------------------------------------------------------> | | | | S. 0(0) ack 21 <MP_CAPABLE> | | <-------------------------------------------------------- | | | | . 1(100) ack 21 <DSS ack=1 seq=1 ssn=1 dlen=100> | | <-------------------------------------------------------- | | | | . 21(0) ack 1 <MP_CAPABLE> | | --------------------------------------------------------> | | | | . 21(20) ack 101 <DSS ack=101 seq=1 ssn=1 dlen=20> | | --------------------------------------------------------> | | | Figure 19: The Listener Supports TFO Corrected Text -------------- initiator listener | | | S 0(20) <MP_CAPABLE>, <TFO cookie> | | --------------------------------------------------------> | | | | S. 0(0) ack 21 <MP_CAPABLE> | | <-------------------------------------------------------- | | | | . 1(100) ack 21 <DSS seq=1 ssn=1 dlen=100, M=1, A=0> | | <-------------------------------------------------------- | | | | . 21(0) ack 1 <MP_CAPABLE> | | --------------------------------------------------------> | | | | . 21(20) ack 101 <DSS ack=101 seq=1 ssn=1 dlen=20> | | --------------------------------------------------------> | | | Figure 19: The Listener Supports TFO Notes ----- The example for TCP Fastopen with MPTCPv1 in RFC8684, Appendix-B.3 shows the listener sending an incorrect data-ack in its first data packet to the initiator sent immediately after its SYN-ACK. At this point, the listener has not received the initiator's key, so it cannot generate the data-ack in it's response packets. The correct behaviour would be to set flag 'A' to 0 and exclude sending data-ack until the initiator's key is received. Instructions: ------------- This erratum is currently posted as "Reported". If necessary, please use "Reply All" to discuss whether it should be verified or rejected. When a decision is reached, the verifying party can log in to change the status and edit the report, if necessary. -------------------------------------- RFC8684 (draft-ietf-mptcp-rfc6824bis-18) -------------------------------------- Title : TCP Extensions for Multipath Operation with Multiple Addresses Publication Date : March 2020 Author(s) : A. Ford, C. Raiciu, M. Handley, O. Bonaventure, C. Paasch Category : PROPOSED STANDARD Source : Multipath TCP Area : Transport Stream : IETF Verifying Party : IESG
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