sysctl: unknown oid 'net.inet.ip.fw.dyn_keepalive'

[Carl Mark]

Hello folks,

  I have a machine running 4.10-STABLE with IPFW and i've been reading its 
manpage but im missing something here.

  The sysctl oid net.inet.ip.fw.dyn_keepalive does not exist in my system:

sysctl: unknown oid 'net.inet.ip.fw.dyn_keepalive'

Anyone has an ideia on why this is happening?

Thanks

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