Iptables reload restart on Ubuntu
Install iptables-persistent
$ sudo apt-get update
$ sudo apt-get install iptables-persistent
Manage
$ sudo systemctl save netfilter-persistent
$ sudo systemctl restart netfilter-persistent
$ sudo apt-get update
$ sudo apt-get install iptables-persistent
$ sudo systemctl save netfilter-persistent
$ sudo systemctl restart netfilter-persistent