LED Netdev Trigger

modulename: ledtrig-netdev.ko

configname: CONFIG_LEDS_TRIGGER_NETDEV

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>LED Trigger support
└─>LED Netdev Trigger
In linux kernel since version 4.2 (release Date: 2015-08-30)  
This allows LEDs to be controlled by network device activity.
If unsure, say Y.

source code:
drivers/leds/trigger/ledtrig-netdev.c