It's included by default in Ubuntu 14.04, so we only need to make a few rules and configuration edits, then switch the firewall on. Ufw is a front-end for iptables and setting up ufw is not hard. Near the top of the sysctl, uncomment the line: We need to make this permanent so the server still forwards traffic after rebooting. Enable packet forwarding during runtime by entering this command: Otherwise, the traffic will stop at the server. This is a sysctl setting which tells the server's kernel to forward traffic from client devices out to the Internet. This is an unprivileged user with no default login capabilities, often reserved for running untrusted applications like web-facing servers. We'll instead confine OpenVPN to the user nobody and group nogroup. Uncomment both user nobody and group nogroup so it looks like:īy default, OpenVPN runs as the root user and thus has full root access to the system. Though OpenDNS is the default used by OpenVPN, you can use whichever DNS services you prefer.
However, it's important to specify desired DNS resolvers in client devices as well. This can help prevent DNS requests from leaking outside the VPN connection. This tells the server to push OpenDNS to connected clients for DNS resolution where possible. Uncomment push "redirect-gateway def1 bypass-dhcp" so the VPN server passes on clients' web traffic to its destination. push "redirect-gateway def1 bypass-dhcp" There are several changes to make in this file. Once extracted, open nf in a text editor. Gunzip -c /usr/share/doc/openvpn/examples/sample-config-files/ > /etc/openvpn/nf This can be done with one command, you should temporarily become root for this: The example VPN server configuration file needs to be extracted to /etc/openvpn so we can incorporate it into our setup.
Then we can install OpenVPN and Easy-RSA. In this lab we will need to be root for almost everything so save yourself some time and: Generally, it is best to perform all operations as a user unless necessary and to use sudo to elevate the privileges when required.
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