[tcpm] Early assignment of IANA TCP option number for AccECN

["Scheffenegger, Richard" <[e-mail]>]

Hi,

As one of the authors of the AccECN draft, which approaches the final
stages, I wanted to see if there is support to ask IANA for an early
assignment of the two TCP Option numbers for AccECN.

The background here is, that the current use of the experimental option
in Linux (0xACC0 and 0xACC1) is not really documented - the draft only
mentiones the experimental ID 0xACCE which was in use prior of the
decision to go with two distinct option numbers.

However, the implementations between Linux and FreeBSD deviated - Linux
using two different experimental IDs (see above), while the FreeBSD
variant differentiated by an additional byte after the experiment ID
(0xACCE).

As some alignment here is needed in the code anyway, maybe this can make
use of the  IANA assigned, final option numbers right away.

This showed up as one point during the Hackathon L3S interoperability
testing.

If the group generally agrees, I would want to ask the chairs to support
this request on behalf of the authors at IANA.

Also, I would like to suggest the assignment of 0xAC (172) and 0xAE
(174) for use with the AccECN tcp option (ACcurate ecn, and Accurate
Ecn) - but I admit that there is no other reason than vanity for these
specific numbers.

Best regards,
    Richard