{
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    "abstract": "This document discusses the issues associated with mobility management for dual stack mobile nodes. Currently, two mobility management protocols are defined for IPv4 and IPv6. Deploying both in a dual stack mobile node introduces a number of problems. Deployment and operational issues motivate the use of a single mobility management protocol. This document discusses such motivations. The document also discusses requirements for the Mobile IPv4 (MIPv4) and Mobile IPv6 (MIPv6) protocol so that they can support mobility management for a dual stack node. This memo provides information for the Internet community.",
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    },
    "authors": [
      {
        "name": "George Tsirtsis"
      },
      {
        "name": "Hesham Soliman"
      }
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
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      "updated": "2026-10-16T15:47:32.251Z",
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    "docId": "RFC4977",
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      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
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    "docLabel": "IETF RFC 4977",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
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    "docNumber": "4977",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docTitle": "Problem Statement: Dual Stack Mobility",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docType": "Informational",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "doi": "10.17487/RFC4977",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "href": "https://doi.org/10.17487/RFC4977",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "keywords": [
      "Mobility Management Protocol",
      "MIPv4",
      "MIPv6",
      "Mobile IP"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "pages": "8",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publicationDate": "2007-08-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "references": {
      "bibliographic": [
        "RFC3261",
        "RFC4068",
        "RFC4140"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=6 proseBlocks=9 skippedAnchorBlocks=7",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
        "updated": "2026-10-16T15:47:32.251Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "normative": [
        "RFC2765",
        "RFC3344",
        "RFC3775"
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      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
        "updated": "2026-10-16T15:47:32.251Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc4977/",
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      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
      "updated": "2026-10-16T15:47:32.251Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
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    "status": {
      "active": true,
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
        "updated": "2026-10-16T15:47:32.251Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "errataExist": false,
      "errataExist$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/rfc4977/",
        "updated": "2026-10-16T15:47:32.251Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
        "updated": "2026-10-16T15:47:32.251Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "statusNote": "Informational",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
        "updated": "2026-10-16T15:47:32.251Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4977/",
        "updated": "2026-10-16T15:47:32.251Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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}