[e2e] Are we doing sliding window in the Internet?

Joe Touch touch at ISI.EDU
Wed Jan 3 15:51:07 PST 2007

Ted Faber wrote:
> On Wed, Jan 03, 2007 at 02:08:32PM -0800, Joe Touch wrote:
>> Granted, 'every two' is a SHOULD not a MUST, but that's the only place
>> for Linux's behavior to be considered compliant. I don't see sufficient
>> reason in "well, it makes *us* go faster" to warrant overriding SHOULD.
> A TCP implementation that acknowledges every packet (and otherwise
> implements all MUSTs in the relevant RFCs) is a (conditionally)
> compliant implementation as defined by RFC1122.  I really don't see any
> ambiguity there. (OK, RFC1122 could say that all conditionally and
> unconditionally compliant implementations are compliant, which it
> doesn't, so strictly speaking I should remove the parens around
> "conditionally" above: "anal-retentive" is hyphenated.)

Conditional compliance should come with a statement of the conditions.
Absent that, it's just buggy.

Reasonable conditions do not include "it makes *us* go faster"; the
include things like "this implementation is to be deployed in a limited
environment that is overwhelmingly satellite-oriented" - e.g., if
DirectPC were to use a variant for proxy traffic to its home routers
that overrode SHOULDs for those reasons, that'd be non-buggy.


Joe Touch
Sr. Network Engineer, USAF TSAT Space Segment

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