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[lwip-devel] [bug #21522] Zero-window probe

From: Oleg Tyshev
Subject: [lwip-devel] [bug #21522] Zero-window probe
Date: Tue, 06 Nov 2007 09:09:37 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20071025 Firefox/


                 Summary: Zero-window probe
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: olegreen
            Submitted on: Tuesday 11/06/2007 at 09:09
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 



I think following case is not processed in lwip correct way.

Communication between host1 and host2.
Host1 advertises zero window.

Unacknoledged queue of the host2 is empty,
unsent queue contains some data.
In accordance with RFC-793 Section 3.7, host2 should
send zero-window probe, but it does not.
If host1 goes down, host2 is still sure, that connection is OK.


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