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If your default iptables OUTPUT value is not ACCEPT, you will also need a line like: iptables -A OUTPUT -o tun+ -j ACCEPT iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE

change the ip address mask according to your info of tun0 result while running "ifconfig" command. NAT the VPN client traffic to the Internet.

Iptables -A FORWARD -i eth0 -o tun+ -m state -state RELATED,ESTABLISHED -j ACCEPT Iptables -A FORWARD -i tun+ -o eth0 -m state -state RELATED,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -m state -state NEW -p udp -dport 1194 -j ACCEPTĪllow TUN interface connections to OpenVPN server iptables -A INPUT -i tun+ -j ACCEPTĪllow TUN interface connections to be forwarded through other interfaces iptables -A FORWARD -i tun+ -j ACCEPT If you are using udp or another port number then change this line accordingly. First let's allow the tcp connection on the openvpn port. If you have installed the openvpn server and iptable is blocking the service by default then use these configurations for openvpn to function properly.