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[lwip-devel] [bug #49717] Window size in received SYN and SYN-ACK assume


From: Ambroz Bizjak
Subject: [lwip-devel] [bug #49717] Window size in received SYN and SYN-ACK assumed scaled but is not
Date: Sun, 27 Nov 2016 19:29:38 +0000 (UTC)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.90 Safari/537.36

Follow-up Comment #1, bug #49717 (project lwip):

Also I find it strange that lwIP even looks at the window size in a received
SYN (not SYN-ACK) segment, because it won't send any real data until the
transition from SYN_RCVD to ESTABLISHED.

Looks like lwIP will even accept a zero window size in the SYN in which case
it would never send the SYN-ACK but start sending window probes.

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