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    "abstract": "Many protocols must detect packet loss for various reasons (e.g., to ensure reliability using retransmissions or to understand the level of congestion along a network path). While many mechanisms have been designed to detect loss, ultimately, protocols can only count on the passage of time without delivery confirmation to declare a packet \"lost\". Each implementation of a time-based loss detection mechanism represents a balance between correctness and timeliness; therefore, no implementation suits all situations. This document provides high-level requirements for time-based loss detectors appropriate for general use in unicast communication across the Internet. Within the requirements, implementations have latitude to define particulars that best address each situation.",
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    "authors": [
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        "name": "Mark Allman"
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      "originalValue": null,
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      "confidence": "high",
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      "source": "parsed",
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    "docTitle": "Requirements for Time-Based Loss Detection",
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    "doi": "10.17487/RFC8961",
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      "confidence": "high",
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      "updated": "2026-10-20T21:46:55.237Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
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      "confidence": "high",
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      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8961/",
      "updated": "2026-10-20T21:46:55.237Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
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    "keywords": [
      "RTO",
      "Packet Loss",
      "Loss Detection"
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        "Retransmission Timeout",
        "Packet Loss",
        "Loss Detection"
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      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8961/",
      "updated": "2026-10-20T22:11:33.708Z",
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      "confidence": "high",
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      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8961/",
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    "publicationDate": "2020-11-01",
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      "confidence": "high",
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      "source": "parsed",
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      "updated": "2026-10-20T21:46:55.237Z",
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      "bibliographic": [
        "IETF.draft-ietf-tcpm-rack-13",
        "IETF.draft-dukkipati-tcpm-tcp-loss-probe-01",
        "IETF.draft-ietf-quic-recovery-32",
        "10.1145-52325.52356",
        "RFC1034",
        "RFC1035",
        "RFC2018",
        "RFC2140",
        "RFC2883",
        "RFC3124",
        "RFC3261",
        "RFC3522",
        "RFC3708",
        "RFC4960",
        "RFC5681",
        "RFC5682",
        "RFC5740",
        "RFC6182",
        "RFC6298",
        "RFC6675",
        "RFC7323",
        "orphan/RFC8961/h:9e48fad5",
        "orphan/RFC8961/h:9874d39e"
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        "confidence": "high",
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        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8961/",
        "updated": "2026-10-20T21:46:55.238Z",
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      },
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        "RFC8174"
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        "confidence": "high",
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        "originalValue": [],
        "source": "parsed",
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      "source": "resolved",
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      "updated": "2026-10-20T21:46:55.237Z",
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8961/",
        "updated": "2026-10-20T21:46:55.237Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
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      "errataExist": false,
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        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8961/",
        "updated": "2026-10-20T21:46:55.237Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
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      "latestVersion": true,
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8961/",
        "updated": "2026-10-20T21:46:55.237Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
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        "confidence": "high",
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        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8961/",
        "updated": "2026-10-20T21:46:55.237Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
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        "confidence": "high",
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        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8961/",
        "updated": "2026-10-20T21:46:55.237Z",
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