Network packet drop alerting service

modulename: drop_monitor.ko

configname: CONFIG_NET_DROP_MONITOR

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network testing
└─>Network packet drop alerting service
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
This feature provides an alerting service to userspace in the
event that packets are discarded in the network stack. Alerts
are broadcast via netlink socket to any listening user space
process. If you don't need network drop alerts, or if you are ok
just checking the various proc files and other utilities for
drop statistics, say N here.

source code:
depends
CONFIG_INET
CONFIG_NET
CONFIG_TRACEPOINTS