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Re: statement regarding keepalives

Joe Touch <touch@strayalpha.com> Thu, 16 August 2018 22:53 UTC

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Subject: Re: statement regarding keepalives
From: Joe Touch <touch@strayalpha.com>
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Date: Thu, 16 Aug 2018 15:52:54 -0700
Cc: Kent Watsen <kwatsen@juniper.net>, HMikael Abrahamsson <swmike@swm.pp.se>, "tsv-area@ietf.org" <tsv-area@ietf.org>, "tsvwg-ads@tools.ietf.org" <tsvwg-ads@tools.ietf.org>, "tls-ads@ietf.org" <tls-ads@ietf.org>, "netconf-chairs@ietf.org" <netconf-chairs@ietf.org>
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To: Benjamin Kaduk <kaduk@mit.edu>
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On Aug 16, 2018, at 3:10 PM, Benjamin Kaduk <kaduk@mit.edu> wrote:

>> Keepalives at a layer SHOULD NOT be interpreted as implying state at
>> any other layer.
> 
> What's going on here in the last sentence is probably a bit subtle -- a
> keeaplive both does not indicate "real" protocol activity but also can
> serve to exercise the lower protocol layers (and, even, per the previous
> sentence, suppresses their keepalives).

That may be intended but is never actually known. Lower layers can compress, cache, merge, and otherwise change the effect a transmission st one layer has on any other. 

Protocols should avoid trying to do this. 

Joe

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