How did I configure `iptables` for OpenVPN Server 2.6.1 on Debian 12?

1

iptables -A INPUT -i eth0 -m state --state NEW -p udp --dport 1194 -j ACCEPT
iptables -A INPUT -i tun+ -j ACCEPT
iptables -A FORWARD -i tun+ -j ACCEPT
iptables -A FORWARD -i tun+ -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth0 -o tun+ -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE
iptables -A OUTPUT -o tun+ -j ACCEPT

2

How to apply iptables changes on Debian 12?

3

apt install iptables-persistent

Answer «No» to «Save current IPv4 rules?».

4

Create /etc/iptables/rules.v4 with the rules of point 1:

5

netfilter-persistent reload