[lwip-devel] [bug #20199] TCP appears to be "Shrinking the Window"

[Tom Evans]

Follow-up Comment #2, bug #20199 (project lwip):

The current (2007) code looks to be doing something that was "STRONGLY
DISCOURAGED in 1981 and also disobeying a "SHOULD NOT" from 1989.

The suggested change would result in it disobeying a "MUST" (in other words
changing to do a "MUST NOT") from 1989.

Going from doing something "STRONGLY DISCOURAGED" 26 years ago and "SHOULD
NOT" 18 years ago to an 18-year-old "MUST NOT" is probably a backwards step.

This isn't that hard to fix. Just check the BSD, Linux or later Xinu code for
examples and follow the RFCs.

I'd fix this except we're not using TCP here, and this sort of thing needs to
be tested properly to ensure the window does the right thing under all
circumstances. Not hard, just test via 127.0.0.1 with test client and
server.

Anyone using lwIP's TCP with these bugs unfixed who isn't sweating and
shaking "doesn't understand the problem".


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