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[lwip-devel] [bug #44399] receiving TCP Ack packet with Window Update


From: Joel Cunningham
Subject: [lwip-devel] [bug #44399] receiving TCP Ack packet with Window Update
Date: Wed, 11 Mar 2015 22:05:27 +0000
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0

Follow-up Comment #3, bug #44399 (project lwip):

Simon,

I did misread what OP said.  I think because he said Wireshark marked the
packet as a Window Update, I got confused thinking SEQ and ACK had not
advanced.

As you've noted, if SEQ and ACK are advanced from the last packet received,
then it's not a pure window update.  Conditional checks 1 or 2 (in
tcp_receive) should trigger and update the window

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