On Thu, Jan 28, 2010 at 9:26 AM, Igor R
I was under impression that it's achievable in some more simple way...
It's basically the silent "drop-off" caused by the cut cable that is hosing you. Unfortunately, as per the RFC (1122?), keep-alive is an optional feature, and is off by default. TCP was basically designed to allow indefinite operation in the absence of message traffic, which saves both bandwidth and CPU. Two commodities which were much more precious when TCP was invented. Though, even today, heartbeat-based systems tend not to scale well.
Thanks for the clarifcation.
You bet. And if you come up w/ a scheme using TCP that doesn't require some form of keep-alive or heartbeat message, then I'm definitely interested in hearing about it. Jon