Netfilter packet duplication support

modulename: nf_dup_netdev.ko

configname: CONFIG_NF_DUP_NETDEV

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>Netfilter packet duplication support
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This option enables the generic packet duplication infrastructure
for Netfilter.

source code: