[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[lwip-users] Unusual termination of a TCP connection.

From: Roger Cover
Subject: [lwip-users] Unusual termination of a TCP connection.
Date: Wed, 28 Sep 2016 09:38:49 -0700


I have a server application using lwIP 1.4.1. When I use a Python program to 
connect to my server, the server always terminates the TCP connection with a 
RST instead of a FIN packet. The RST appears to be negatively impacting the 
performance of my communications. I have attached a Wireshark capture of the 
traffic in the attached file lwIP141.pcapng. In this file my server is at 

I previously implemented a server using the lwIP 1.2.0 library (about a decade 
ago), and did not encounter this problem. The attached file lwip120.pcapng is a 
Wireshark capture of the same Python program communicating with the old lwIP 
1.2.0 server. In this file my server is at address Using lwIP 
1.2.0 the TCP connection terminates normally with a FIN, FIN+ACK, ACK set.

Does anyone have any insight into why the RST is being issued? Is there 
anything I can do to eliminate this problem? I look forward to your reply.

Roger W. Cover
Spectral Instruments, Inc.
420 N. Bonita Ave.
Tucson, AZ 85745
520-884-8821 ext. 144

Attachment: lwIP141.pcapng
Description: lwIP141.pcapng

Attachment: lwIP120.pcapng
Description: lwIP120.pcapng

reply via email to

[Prev in Thread] Current Thread [Next in Thread]