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Mastering OpenVPN by Jan Just Keijser, Eric F Crist

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Client-specific configuration – CCD files

In a setup where a single server can handle many clients, it is sometimes necessary to set per-client options that overrule the global options, or to add extra options to a particular client. The option client-config-dir is very useful for this. It allows the VPN administrator to assign a specific IP address to a client, in order to push specific options such as a DNS server to a particular client or to temporarily disable a client altogether. This option is also vital if you want to route a subnet from the client side to the server side, as we will see later on.

A client-config-dir or CCD file can contain the following options:

  • push: This is useful for pushing DNS and WINS servers, routes, and so on
  • push-reset ...

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