{
  "number": 1191,
  "title": "Path MTU discovery",
  "authors": [
    "J. Mogul",
    "S. Deering"
  ],
  "published": "1990-11",
  "status": "Draft Standard",
  "stream": "Legacy",
  "pages": 19,
  "formats": [
    "TXT",
    "HTML"
  ],
  "abstract": "This memo describes a technique for dynamically discovering the maximum transmission unit (MTU) of an arbitrary internet path. It specifies a small change to the way routers generate one type of ICMP message. For a path that passes through a router that has not been so changed, this technique might not discover the correct Path MTU, but it will always choose a Path MTU as accurate as, and in many cases more accurate than, the Path MTU that would be chosen by current practice. [STANDARDS-TRACK]",
  "keywords": [
    "IP-MTU"
  ],
  "doi": "10.17487/RFC1191",
  "errata_url": "https://www.rfc-editor.org/errata/rfc1191",
  "obsoletes": [
    "RFC1063"
  ],
  "urls": {
    "html": "https://rfc.dk/rfc1191/",
    "text": "https://rfc.dk/rfc1191.txt",
    "rfc_editor": "https://www.rfc-editor.org/rfc/rfc1191",
    "datatracker": "https://datatracker.ietf.org/doc/rfc1191/"
  },
  "text_modified": "1990-11-17T01:21:19Z"
}