Run command on suspend

Create a file located in /usr/lib/systemd/system-sleep directory:

#!/bin/sh
if [ "${1}" == "pre" ]; then
  nordvpn d
elif [ "${1}" == "post" ]; then
  echo "Hello"
fi

Debug route table

List all routes in system:

route -n

Get route for a specific IP:

ip route get 1.1.1.1

Log denied connections in firewalld

Edit filr /etc/sysconfig/firewalld:

FIREWALLD_ARGS=--debug=10