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Re: [tcpm] 793bis ready to go?

Yuchung Cheng <ycheng@google.com> Tue, 04 May 2021 15:59 UTC

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From: Yuchung Cheng <ycheng@google.com>
Date: Tue, 04 May 2021 08:59:08 -0700
Message-ID: <CAK6E8=dyY2Gv8dQkrNStz_swOVk61kyVvmnekOCKi1LDD6HX+A@mail.gmail.com>
To: Wesley Eddy <wes@mti-systems.com>
Cc: "tcpm@ietf.org Extensions" <tcpm@ietf.org>, Neal Cardwell <ncardwell@google.com>
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Subject: Re: [tcpm] 793bis ready to go?
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On Mon, May 3, 2021 at 7:32 PM Wesley Eddy <wes@mti-systems.com> wrote:
>
> On 2/16/2021 3:58 AM, Scharf, Michael wrote:
>
> I'd also be interested in more details. Unfortunately, I am not familiar with BSD.
>
> For what it is worth, RFC 1122 Section 4.2.3.6 "TCP Keep-Alives" states:
>
>             Keep-alive packets MUST only be sent when no data or
>             acknowledgement packets have been received for the
>             connection within an interval.
>
> So, the latter part of the sentence originates from RFC 1122.
>
> Could somebody comment on whether recent BSD stacks would deviate from the proposed text in 793bis? That would be an important insight!
>
>
> This is not answering your question about BSD, but just for reference, the change in that sentence came from consolidated review comments from Microsoft colleagues that was sent to the mailing list:
>
> https://mailarchive.ietf.org/arch/msg/tcpm/rqHhtpqW3m0QikJnaz_4y-y7NyQ/
>
>
> Section 3.7.4
> "Keep-alive packets MUST only be sent when no data or acknowledgement
>    packets have been received for the connection within an interval
>    (MUST-26).
The latest draft looks good to me to publish. Thanks for the revisions!

>
> "
>
> It's important to call out an additional condition - that sends are not already outstanding. When a send is outstanding, it is retransmitted and serves as an implicit liveness check.
>
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