1. 保活功能主要是为服务器应用程序提供的。
The keepalive feature is intended for server applications that might tie up resources on behalf of a client, and want to know if the client host crashes. Many versions of the Telnet server and Rlogin server enable the keepalive option by default.
例如，telnet到一个机器上，然后关机。
2. If there is no activity on a given connection for 2 hours, the server sends a probe segment to the client.
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