TCP: Redundant checksum avoidance specification

Question

TCP provides a mechanism to change the checksum scheme used by the two parties in a TCP session. There are four allowed checksum schemes according to this table, the last being "Redundant Checksum Avoidance".

As far as I understand from this Q&A, the Redundant Checksum Avoidance scheme essentially removes the checksum. Is the checksum then required to be all 0s? Is the checksum altogether removed?

The only RFC covering the change the checksum scheme I found does not cover the Redundant Checksum Avoidance scheme. Where can I find an RFC discussing it?

@MV see http://serverfault.com/questions/454886/is-the-tcp-checksum-over-the-payload — mdpc, Dec 04 '12 at 18:24

score 1 · Accepted Answer · edited Oct 07 '21 at 06:58

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I think the closest protocol, based on your specifications is: DCCP as defined by RFC 4336. The RFC1146 you mentioned is obsoleted by RFC6247. See also: Wikipedia: Comparison of transport-layer protocols

edited Oct 07 '21 at 06:58

Community

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answered Dec 04 '12 at 18:21

Mircea Vutcovici

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Thanks. I'm stuck with TCP. See my comment in the question mdpc linked for a description what I want to do. – Randomblue Dec 04 '12 at 18:30

TCP: Redundant checksum avoidance specification

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