{
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  "docId": "RFC4890",
  "document": {
    "abstract": "In networks supporting IPv6, the Internet Control Message Protocol version 6 (ICMPv6) plays a fundamental role with a large number of functions, and a correspondingly large number of message types and options. ICMPv6 is essential to the functioning of IPv6, but there are a number of security risks associated with uncontrolled forwarding of ICMPv6 messages. Filtering strategies designed for the corresponding protocol, ICMP, in IPv4 networks are not directly applicable, because these strategies are intended to accommodate a useful auxiliary protocol that may not be required for correct functioning. This document provides some recommendations for ICMPv6 firewall filter configuration that will allow propagation of ICMPv6 messages that are needed to maintain the functioning of the network but drop messages that are potential security risks. This memo provides information for the Internet community.",
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      "confidence": "high",
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      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "authors": [
      {
        "name": "Elwyn B. Davies"
      },
      {
        "name": "János Mohácsi"
      }
    ],
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      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docId": "RFC4890",
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      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
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      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docNumber": "4890",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docTitle": "Recommendations for Filtering ICMPv6 Messages in Firewalls",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
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    "docType": "Informational",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "doi": "10.17487/RFC4890",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "href": "https://doi.org/10.17487/RFC4890",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "keywords": [
      "Internet Control Message Protocol Version 6",
      "IPv6",
      "Security",
      "Firewalls",
      "ICMPv6"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "pages": "38",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publicationDate": "2007-05-01",
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      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publisher": "IETF",
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      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
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      "bibliographic": [
        "RFC3041",
        "RFC4380",
        "orphan/RFC4890/h:9008bc31",
        "orphan/RFC4890/h:d10f98f2",
        "orphan/RFC4890/h:092c3b32"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=21 proseBlocks=25 skippedAnchorBlocks=23",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
        "updated": "2026-10-16T15:47:20.550Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
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        "RFC1981",
        "RFC2460",
        "RFC2461",
        "RFC2462",
        "RFC2710",
        "RFC2894",
        "RFC3122",
        "RFC3590",
        "RFC3775",
        "RFC3810",
        "RFC3971",
        "RFC4065",
        "RFC4286",
        "RFC4443",
        "RFC4620"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
        "updated": "2026-10-16T15:47:20.550Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc4890/",
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      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
      "updated": "2026-10-16T15:47:20.550Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
        "updated": "2026-10-16T15:47:20.550Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "errataExist": true,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
        "updated": "2026-10-16T15:47:20.550Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "errataUrl": [
        "https://www.rfc-editor.org/errata/rfc4890",
        "https://www.rfc-editor.org/errata_search.php?rfc=4890",
        "https://www.rfc-editor.org/rfc/inline-errata/rfc4890.html"
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      "errataUrl$meta": {
        "confidence": "high",
        "note": "Parsed from errata links on RFC/Datatracker pages",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
        "updated": "2026-10-16T15:47:20.550Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
        "updated": "2026-10-16T15:47:20.550Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "statusNote": "Informational",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
        "updated": "2026-10-16T15:47:20.550Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4890/",
        "updated": "2026-10-16T15:47:20.550Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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}