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TCP keep alives

Dave Perry

I have a problem with the TCP connection being dropped. The far end drops the connection after a few minutes.

I believe I need to send TCP keepalives periodically to stop the connection from dropping, but I don't see a way to do this. I tried sending a zero length buffer to tcp_send() (with the 3rd param set to 0). That didn't seem to do anything.

Then I tried sending one byte of garbage data periodically, and this keeps the connection up.

I don't want to send garbage. How can I send a proper keepalive (an empty packet with the ACK flag set)?

Dave

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