Joel Cunningham wrote:

According TCP RFCs, a receiver is not allowed to decrease the window,

Not sure that's true.

It's certainly possible to do it illegally, on a linux box tcp will log
a message something like heresy <ip address> shrank window.
That IME is where some middle box is "interfearing".

I've seen plenty of "legal" shrinks looking at tcpdumps - usually the
app is throttling it's read speed.

Just had a look between two Linux boxes on my lan and

wget --limit-rate=10k will do to see shrinking advertised window by
receiver using tcpdump.


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