Firewalls
nftables
List currently active ruleset: sudo nft list ruleset
Reload config file: sudo nft -f /etc/nftables.conf
iptables
List currently active ruleset: sudo iptables -L
Reload config file: sudo /sbin/iptables-restore < /etc/iptables_vpn.rules
Flush all chains: sudo iptables -F
Delete all chains: sudo iptables -X