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[lwip-devel] [bug #20075] A problem with keep-alive timer and TCP flags

From: Srinivas Gollakota
Subject: [lwip-devel] [bug #20075] A problem with keep-alive timer and TCP flags
Date: Mon, 04 Jun 2007 20:49:14 +0000
User-agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; YComp; .NET CLR 1.1.4322)


                 Summary: A problem with keep-alive timer and TCP flags
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: gollakota
            Submitted on: Monday 06/04/2007 at 16:49
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any



I'm using tcp keep-alive timer in my application. Whilst sending the
keep-alive probes occasionally FIN and RST flags were
getting set in the outgoing segment. 

In the tcp_keepalive()/tcp_out.c tcp flags field is not set.By setting the
ack flag seems to fix the problem.
[ TCPH_FLAGS_SET( tcphdr, TCP_ACK );]

Could anyone confirm this problem and whether the above solution is correct
or not?



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