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Found 2 records.

Status: Verified (2)

RFC 7413, "TCP Fast Open", December 2014

Source of RFC: tcpm (tsv)

Errata ID: 4238

Status: Verified
Type: Technical

Reported By: Matthew Luckie
Date Reported: 2015-01-22
Verifier Name: Martin Stiemerling
Date Verified: 2015-11-02

Section 4.1.1 says:

   Kind            1 byte: value = 34
   Length          1 byte: range 6 to 18 (bytes); limited by
                           remaining space in the options field.
                           The number MUST be even.
   Cookie          0, or 4 to 16 bytes (Length - 2)

It should say:

   Kind            1 byte: value = 34
   Length          1 byte: range 2 to 18 (bytes); limited by
                           remaining space in the options field.
                           The number MUST be even.
   Cookie          0, or 4 to 16 bytes in length (Length - 2)

Notes:

A Nil cookie is a fast open option with no cookie value. A length range of 6 to 18 bytes excludes a Nil cookie.

Errata ID: 4239

Status: Verified
Type: Technical

Reported By: Matthew Luckie
Date Reported: 2015-01-22
Verifier Name: Martin Stiemerling
Date Verified: 2015-10-31

Section 4.2.1 says:

   1. The client sends a SYN packet with a Fast Open option with a
      Length field of 0 (empty cookie field).

It should say:

   1. The client sends a SYN packet with a Fast Open option with a
      Length field of 2 (empty cookie field).

Notes:

A Nil fast-open option has an option length of 2. A length field of zero would mean an invalid TCP option.

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