how to set last_ack timeout

how to set last_ack timeout?
Code:
113.107.160.5.8680   60.161.246.17.13562    LAST_ACK
if 60.161.246.17 don't send last ack packages,the state LAST_ACK will keep all the time?
how to set last_ack timeout? thanks
 
only find
Code:
net.inet.tcp.finwait2_timeout: 300
net.inet.tcp.fast_finwait2_recycle: 1
for timeout,but not for last_ack
 
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