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Enable forwarding:
sysctl -w net.ipv4.ip_forward=1
Create this script eg sudo nano iptables.sh
eth=$1
proto=$2
port=$3
# OpenVPN
iptables -A INPUT -i "$eth" -m state --state NEW -p "$proto" --dport "$port" -j ACCEPT
# Allow TUN interface connections to OpenVPN server
iptables -A INPUT -i tun+ -j ACCEPT
# Allow TUN interface connections to be forwarded through other interfaces
iptables -A FORWARD -i tun+ -j ACCEPT
iptables -A FORWARD -i tun+ -o "$eth" -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i "$eth" -o tun+ -m state --state RELATED,ESTABLISHED -j ACCEPT
# NAT the VPN client traffic to the internet
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o "$eth" -j MASQUERADE
Run the script with sudo bash iptables.sh eth0 udp 1194:
Now test it!
If it didn’t work reboot.
If it did work save the configuration with iptables-persistent.
Debian/Ubuntu: sudo apt install iptables-persistent. If already installed you can use sudo dpkg-reconfigure iptables-persistent.
Fedora: Consider using firewalld instead of iptables.
Source: GitHub
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