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TCP keepalived how does it work

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linux-howto

http://serverfault.com – I run on Ubuntu and i want to use TCP keepalived in order to implement hearbeat between master-slave.both servers are my impl (c++). I read this overview and did some google. i didnt understand what TCP keepalived send and i do know if connection is no longer valid when use in TCP keepalive ?. Do i need to check the revived content? (HowTos)