Originally written for Posix-compatible Unix-like operating system, Unbound currently runs on Free BSD, Open BSD, Net BSD, and Linux, as well as Microsoft Windows.The install and configuration of Unbound is incredibly easy.

Now that you understand the four main responsibilities of the Authentication Policy, it will be easier to understand why you are doing the things that are introduced in this section.As for the configuration, a simple resolving caching DNS server which can be used for a single machine or multi-machine LAN is only a few lines long.Note that Unbound is not a full fledged authoritative server, but you can put in A records for forward and reverse resolution of a small private LAN.The name CAS also refers to a software package[1] that implements this protocol.The CAS protocol involves at least three parties: a client web browser, the web application requesting authentication, and the CAS server.