DHCP using Microsoft DHCP services given that we are also using Microsoft DNS services it makes sense to do it this way.
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Windows clients can accept pushed DHCP options natively, while non-Windows clients can accept them by using a client-side up script which parses the foreignoption n environmental variable list. See the man page for non-Windows foreignoption n documentation and script examples. Openvpn Dhcp-Options Handlers Install OpenVPN ServerClient Configuration Remember the shell script you used earlier to install OpenVPN Server Running that script again will prompt you with a different set of options as OpenVPN is now already installed on your server. This has no Graphical User Interface like in OpenVPN Access Server where you can simply configure it using the web interface. The purpose of writing this is to keep a reference for myself and to help anyone that needs to implement this. Of course there are guides all over the interwebz to do this same task but I had to collect information from different places to get it right so hope this helps. OpenVPN Server Installation if you havent done it already Installation process of OpenVPN server can be tedious if youre doing it from scratch. But fortunately, people have come up with scripts to help deploy it within minutes. I used this script to get it up and running on my Ubuntu 18.04 server. This script should be compatible with other distros like Debian, CentOS and Fedora. But of course you can stick to the normal installation procedure by following this comprehensive guide provided by DigitalOcean. Openvpn Dhcp-Options Handlers Download The ShellSimply download the shell script, give it execute permissions and execute it. Itll prompt you several questions and youve got yourself a VPN server. OpenVPN installation script by Nyr on GitHub Server Configuration Before going ahead with configuring authentication via AD, lets take a look at the server configuration file of the OpenVPN installation. So the first step in configuring authentication via AD is to comment out those 2 lines or remove them so that users who have the client profile cannot login anonymously. Then go ahead and install the OpenVPN LDAP package on your server to get the required libraries and configuration files. You can grab an example LDAP configuration file at usrsharedocopenvpn-auth-ldapexamplesauth-ldap.conf and paste it to etcopenvpnauthauth-ldap.conf (This path can be anything really, as long as you point it properly in the server configuration file). Heres my configuration for reference; LDAP server URL URL ldap: Bind DN (If your LDAP server doesnt support anonymous binds) BindDN CNOpenVPN Bind User,OUSubOU,OUMyOrg Users,DCdomain,DClocal Bind Password Password Password for the service account Network timeout (in seconds) Timeout 15 Enable Start TLS TLSEnable no Follow LDAP Referrals (anonymously) FollowReferrals no Base DN BaseDN OUSubOU,OUMyOrg Users,DCdomain,DClocal User Search Filter SearchFilter (samaccountnameu) Require Group Membership RequireGroup false First, define the IP address or the hostname to your Active Directory server in the first highlighted section. It is recommended to create a service account with the least amount of privileges so that the account can only read the content of your AD and cannot make any changes, which is what we need for this. Then provide the Distinguished Name of the service account along with the Password for that account. ![]() In the Authorization section of the configuration file, provide the base DN to find the users in. And for the SearchFilter attribute, provide the value as samaccountname so that OpenVPN picks up the username of each user in AD for the authentication process. You may also configure group membership attributes in the same section so that you can only allow people who are in a specific AD group to have access to the VPN connection. Group related attributes can be found in the example OpenVPN LDAP configuration file Ive mentioned earlier. ![]() Simply add the following two lines to your server configuration file at the end of etcopenvpnserverserver.conf file; plugin usrlibopenvpnopenvpn-auth-ldap.so etcopenvpnauthauth-ldap.conf client-cert-not-required These two lines will tell the OpenVPN server to look for the LDAP configuration file and use the LDAP module to do the authentication via Active Directory rather than an anonymous connection. Next step is to configure the client profile so that it can use Active Directory to authenticate against.
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