etc_iptables_rules.v4.j2

#!/usr/bin/env bash
# Generated by ansible
# This script is used to configure iptables to work with OpenVPN on this host

# Allow connections to the VPN
{% for instance in openvpn_instances %}
{{ iptables_path }} -A INPUT -p {{ instance.proto }} --dport {{ instance.port }} -j ACCEPT
{% endfor %}

# This rule is necessary for OpenVPN to work and forward IP packets
{% for instance in openvpn_instances %}
{{ iptables_path }} -t nat -A POSTROUTING -s {{ instance.cidr }} -o {{ ansible_default_ipv4.interface }} -j MASQUERADE
{% endfor %}

{% for instance in openvpn_instances %}
{{ iptables_path }} -A FORWARD -s {{ instance.cidr }} -j ACCEPT
{% endfor %}

# Allow SSH connections on the VPN
{% for instance in openvpn_instances %}
{{ iptables_path }} -A INPUT -p tcp -d {{ instance.cidr }} --dport {{ ansible_port | default('22') }} -j ACCEPT
{% endfor %}

# Consider removing SSH access from the main IPv4 address after you established a VPN connection, e.g. with:
#{{ iptables_path }} -A INPUT -p tcp -i {{ ansible_default_ipv4.interface }} --dport {{ ansible_port | default('22') }} -j DROP