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I have a situation where a SO_KEEPALIVE on my TCP socket gets no response from the peer device. I have opened the TCP socket for TCP/IP tunneling between my networked device and a Win7 Laptop. i have programmed the socket with options TCPTV_KEEP_IDLE and TCPTV_KEEPINTVL to 10 sec in order to shorten the connection timeout.

While I see the KEEPALIVE probes going out, I don't see any response from the laptop. What could be the reason?

Any assistance is much appreciated. Thanks in advance.

user3471782
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  • This can mean that the connectivity to the peer has been lost. Ethernet cable pull out on the peer end or intermediate router ? Capture tcpdump on the peer(laptop) and see if you are indeed receiving the keep alive probes. In all likelihood, you may not see that. – Prabhu Apr 24 '14 at 10:51
  • The Peer in my case in a Win7 Laptop. It's on the Win7 laptop that I saw the probes coming in (on Wireshark). Strangely, the Win7 laptop doesn't respond to it. Any possible reasons? – user3471782 Apr 27 '14 at 08:11
  • Can you show the Wireshark dump on the laptop? – Prabhu Apr 27 '14 at 16:00
  • [IMG]http://i62.tinypic.com/281x3cy.png[/IMG] – user3471782 Apr 30 '14 at 10:25
  • Can you see it? I don't know if I added it correctly. 192.168.1.102 is the IP of my networked device and 192.168.1.100 is the IP of the Win7 Laptop. And thank you for your interest in helping me out. – user3471782 Apr 30 '14 at 10:27

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