Connection tracking events


Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>Connection tracking events
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
If this option is enabled, the connection tracking code will
provide a notifier chain that can be used by other kernel code
to get notified about changes in the connection tracking state.

If unsure, say `N'.