Re: [tcpm] [Technical Errata Reported] RFC5925 (4365)

[Joe Touch <[e-mail]>]

Hi, all,

Thanks to Michael Sharf for pointing this out.

This can be flagged as "wait for update" because it's not critical to
the operation of the option.

Joe

On 5/12/2015 1:46 PM, RFC Errata System wrote:
> The following errata report has been submitted for RFC5925,
> "The TCP Authentication Option".
> 
> --------------------------------------
> You may review the report below and at:
> http://www.rfc-editor.org/errata_search.php?rfc=5925&eid=4365
> 
> --------------------------------------
> Type: Technical
> Reported by: Joe Touch <[e-mail]>
> 
> Section: 7.6
> 
> Original Text
> -------------
>    TCP's 4-bit data offset requires that the options end 60 bytes (15
>    32-bit words) after the header begins, including the 20-byte header.
>    This leaves 40 bytes for options, of which 15 are expected in current
>    implementations (listed below), leaving at most 25 for other uses.
>    TCP-AO consumes 16 bytes, leaving 9 bytes for additional SYN options
>    (depending on implementation dependant alignment padding, which could
>    consume another 2 bytes at most).
> 
>    o  SACK permitted (2 bytes) [RFC2018][RFC3517]
> 
>    o  Timestamps (10 bytes) [RFC1323]
> 
>    o  Window scale (3 bytes) [RFC1323]
> 
> 
> Corrected Text
> --------------
>    TCP's 4-bit data offset requires that the options end 60 bytes (15
>    32-bit words) after the header begins, including the 20-byte header.
>    This leaves 40 bytes for options, of which 19 are expected in current
>    implementations (listed below), leaving at most 21 for other uses.
>    TCP-AO consumes 16 bytes, leaving 5 bytes for additional SYN options
>    (depending on implementation dependent alignment padding, which could
>    consume another 2 bytes at most).
> 
>    o  SACK permitted (2 bytes) [RFC2018][RFC3517]
> 
>    o  Timestamps (10 bytes) [RFC1323]
> 
>    o  Window scale (3 bytes) [RFC1323]
> 
>    o  Maximum Segment Size (4 bytes) [RFC793]
> 
> 
> Notes
> -----
> MSS was missing in the original text. New text includes MSS and updates numbers accordingly.
> 
> Also corrects a spelling error (dependant -> dependent), which is non-technical but included in the revised text.
> 
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party (IESG)
> can log in to change the status and edit the report, if necessary. 
> 
> --------------------------------------
> RFC5925 (draft-ietf-tcpm-tcp-auth-opt-11)
> --------------------------------------
> Title               : The TCP Authentication Option
> Publication Date    : June 2010
> Author(s)           : J. Touch, A. Mankin, R. Bonica
> Category            : PROPOSED STANDARD
> Source              : TCP Maintenance and Minor Extensions
> Area                : Transport
> Stream              : IETF
> Verifying Party     : IESG
>