Run OpenVPN on Windows, Mac and Linux/Unix We'll get you past the daunting configuration issues so you can use OpenVPN to provide no-cost, secure networking for your Windows, Mac or Unix/Linux systems. OpenVPN files are plain-text files that contain the instructions for OpenVPN to connect a client to a server or run a server. There are dozens of options for these files. The primary documentation for them is the OpenVPN 2.2 man page. To get there, go to www.openvpn.net and at the top of the page sign in (if you haven't already) and then click the 'support' link at the top of the page. The OpenVPN Connect Client for Mac stores its log files here.
If you want more than just pre-shared keys OpenVPN makes it easy to setup and use a Public Key Infrastructure (PKI) to use SSL/TLS certificates for authentication and key exchange between the VPN server and clients. OpenVPN can be used in a routed or bridged VPN mode and can be configured to use either UDP or TCP. The port number can be configured as well, but port 1194 is the official one. And it is only using that single port for all communication. VPN client implementations are available for almost anything including all Linux distributions, OS X, Windows and OpenWRT based WLAN routers. • a separate certificate (also known as a public key) and private key for the server and each client, and • a master Certificate Authority (CA) certificate and key which is used to sign each of the server and client certificates.
OpenVPN supports bidirectional authentication based on certificates, meaning that the client must authenticate the server certificate and the server must authenticate the client certificate before mutual trust is established. Both server and client will authenticate the other by first verifying that the presented certificate was signed by the master certificate authority (CA), and then by testing information in the now-authenticated certificate header, such as the certificate common name or certificate type (client or server). Ubuntu@testopenvpn-server:~$ sudo systemctl start openvpn@server ubuntu@testopenvpn-server:~$ sudo systemctl status openvpn@server. Ubuntu@testopenvpn-client:~$ sudo systemctl start openvpn@client ubuntu@testopenvpn-client:~$ sudo systemctl status openvpn@client. • Check your journal, e.g. Journalctl --identifier ovpn-server (for server.conf) • Check that you have specified the keyfile names correctly in client.conf and server.conf.
• Can the client connect to the server machine? Maybe a firewall is blocking access?
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Check journal on server. • Client and server must use same protocol and port, e.g. UDP port 1194, see port and proto config option • Client and server must use same config regarding compression, see comp-lzo config option • Client and server must use same config regarding bridged vs routed mode, see server vs server-bridge config option. The above is a very simple working VPN.
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The client can access services on the VPN server machine through an encrypted tunnel. If you want to reach more servers or anything in other networks, push some routes to the clients.
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If your company's network can be summarized to the network 192.168.0.0/16, you could push this route to the clients. But you will also have to change the routing for the way back - your servers need to know a route to the VPN client-network. Or you might push a default gateway to all the clients to send all their internet traffic to the VPN gateway first and from there via the company firewall into the internet.