TimoDJatomika/install-openvpn-ubuntu-18.04.md

## install-openvpn-ubuntu-18.04.md

      
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              install-openvpn-ubuntu-18.04.md
            
          
    How to install OpenVPN on Ubuntu 18.04

by Timo Stankowitz github@brainoftimo.com
apt

sudo su
apt update -y
apt install openvpn -y
certs

Use the programm XCA to generate all certs and keys
mkdir /etc/openvpn/certs
copy the following files into that folder

ca.crt
server.crt
server.key (chown 600)
dh2048.pem

server conf

vi /etc/openvpn/server.conf
copy the following content into that file
port 1194
proto udp
dev tun

ca /etc/openvpn/certs/ca.crt
cert /etc/openvpn/certs/server.crt
key /etc/openvpn/certs/server.key
dh /etc/openvpn/certs/dh2048.pem

server 172.28.28.0 255.255.255.0

push "redirect-gateway def1 bypass-dhcp"

client-to-client

push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 4.2.2.2"

push "topology subnet"
topology subnet

route 172.28.28.0 255.255.255.0

keepalive 10 120

#comp-lzo

user nobody
group nogroup

persist-key
persist-tun

status /var/log/openvpn-status.log
verb 3
log-append /var/log/openvpn

activate masquerade

#!/bin/bash

echo activate MASQUERADE

iptables -t nat -A POSTROUTING -s 172.28.28.0/24 -o eth0 -j MASQUERADE

# enable ip forwarding
sysctl -w net.ipv4.ip_forward=1
reboot

Reboot the server. The OpenVPN Server should start automatically. Verify it with systemctl status openvpn