Re: [tcpm] I-D Action: draft-nishida-tcpm-agg-syn-ext-01.txt

[Carles Gomez Montenegro <[e-mail]>]

Hi Yoshi,

Thanks for your draft, and for taking into account the needs of a new
experimental proposal such as the TARR option.

Indeed, currently, 4 bytes is the minimum format size to announce
support of an RFC 6994-conforming experimental TCP option. However, as
you mention in your draft, the same information might be conveyed by
using less bits.

I've been thinking about whether the number of GID bits (i.e., 2 bits)
is the best choice or not. My own conclusion is that it is, since:

- Number of GID bits = 0 --> it does not allow to omit unused aggregated blocks.
- Number of GID bits = 1 --> it would support only 14 options.
- Number of GID bits = 3 --> it would support 40 options, which
perhaps is not really necessary, and would add one bit of overhead per
aggregated block.

Thanks,

Carles





> Hi folks,
>
> I have submitted an updated version for aggregated option draft.
> The main points of this version are the following, mainly to address Joe's comments.
> - The draft contains now aggregated option only.  delay negotiation proposal has been removed and out of scope of the draft.
> - The main target for aggregated option is a new experimental proposal such as TARR option while It is possible to aggregate existing options with some conditions,
> It would be great if you could provide some feedback.
>
> Thanks,
> --
> Yoshi
>
>
> On Sun, Oct 23, 2022 at 12:15 AM <[e-mail]> wrote:
>>
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts directories.
>>
>>
>>         Title           : Aggregated Option for SYN Option Space Extension
>>         Author          : Yoshifumi Nishida
>>   Filename        : draft-nishida-tcpm-agg-syn-ext-01.txt
>>   Pages           : 9
>>   Date            : 2022-10-23
>>
>> Abstract:
>>    TCP option space is scarce resource as its max length is limited to
>>    40 bytes.  This limitation becomes more significant in SYN segments
>>    as all options used in a connection should be exchanged during SYN
>>    negotiations.  This document proposes a new SYN option negotiation
>>    scheme that can aggregate multiple TCP options in SYN segments into a
>>    single option so that more options can be negotiate during 3 way
>>    handshake.  With its simple design, the approach does not require
>>    fundamental changes in TCP.
>>
>>
>> The IETF datatracker status page for this draft is:
>> https://datatracker.ietf.org/doc/draft-nishida-tcpm-agg-syn-ext/
>>
>> There is also an HTML version available at:
>> https://www.ietf.org/archive/id/draft-nishida-tcpm-agg-syn-ext-01.html
>>
>> A diff from the previous version is available at:
>> https://www.ietf.org/rfcdiff?url2=draft-nishida-tcpm-agg-syn-ext-01
>>
>>
>> Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts
>>
>>
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>
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