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This is because the Graphical User Interfaces that we are going to learn do not assist you in the creation and maintenance of the OpenVPN’s configuration. Notice, that you will always have to manually edit the configuration file. Keep in mind that certificate of the Certification Authority is required also if you do not use the X.509 client authentication but the “Only Password” authentication (Default in Zeroshell).Įxporting Certification Authority Certificate Otherwise, you must specify the absolute path of the file. If you save the CA’s certificate with the name CA.pem in the same directory of the configuration file, the you do not need to change the parameter. To get the CA’s X.509 certificate, you only need to click on the CA hyperlink in the Zeroshell’s login page. ca CA.pemThe ca parameter specify a file (in PEM format), that contains the X.509 Certification Authority with which the server certificate has been signed.The Zeroshell’s default configuration requires that the OpenVPN service listens on the port 1194/TCP and therefore you must not modify the second parameter (1194). remote 1194You have to replace with the hostname or the IP address of the OpenVPN server.

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In order to further simplify the configuration of the OpenVPN client, you could download an example of configuration file by clicking on the link OpenVPN Client configuration.The file has comments that explain the meaning of the parameters, but only 2 of them you surely need to change to obtain a VPN connection with Zeroshell: In any case, to obtain a connection with a Zeroshell VPN server, you only need to define a small number of them in your client’s configuration file. OpenVPN for Windows Mobile on Pocket PCīecause the large number of parameters you can define either in the configuration file or in the command line, you could configure OpenVPN in many different manners.Keep in mind that the first section, which is related to the configuration file of OpenVPN, it is common to the other ones, because the configuration file do not depend on the GUI or Operating System that you use. The sections in which this how-to is divided are as follows below.

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The user authentication well be checked by using username and password credentials, but we will try the X.509 authentication as well.įor further details about the configuration of an OpenVPN server builded with ZeroShell, you can read the “An OpenVPN server using Zeroshell” how-to.

By default, the OpenVPN server of Zeroshell listens on the port 1194/TCP with TLS/SSL encryption and LZO compression enabled. To obtain an OpenVPN server with the default behavior, you only need, after you have activated Zeroshell on your network, to enable the OpenVPN service by clicking on the Enabled flag in the -> section of the Zeroshell’s web interface.

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More precisely, we will see how to access to a VPN server builded with ZeroShell and configured with the default parameters. In addition, you could use the openvpn command in a script to automatically start the VPN connection. This last possibility is useful, because the openvpn command, which you can execute by using the prompt (Unix Shell or Windows Prompt) accepts the same parameters and has the same behavior regardless from which Operating System you use. At the end of the document we will learn to use the OpenVPN’s command line interface.

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We will see how to install and configure the most used OpenVPN’s GUI for Microsoft Windows, Linux, Mac OS X and Windows Mobile for Pocket PC. The purpose of this document is to lead the users to configure theirs OpenVPN clients to access to a VPN server.