RELENG_8 ignoring TCP window size? [Was: Re: Help for TCP understanding wanted, ACK-MSS-Window [Was: Re: best practice to watch TCP parms of established sockets]]

[Stephen Hurd]

All those duplicate ACKs look like a problme to me... I would be inclined to capture from the other end or from a monitor port on the switch to make sure those are actually hitting the wire.  The only explination I can think of is that the system sending the duplicate ACKs is assuming that it's lost a segment for some reason and is trying to trigger fast recovery early.
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