See KeepAlive counters on tcp connections

netstat -town
See connection's tcp timers
Sample Output
tcp        0      0 192.168.10.117:45979       192.168.1.1:80         ESTABLISHED keepalive (25.96/0/0)
tcp        0      0 192.168.10.117:37418       192.168.0.5:993            ESTABLISHED off (0.00/0/0)

8
2012-10-08 13:10:04

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