What is the difference between a RADIUS realm and a domain registered with the InterNIC?
With RADIUS, a realm is used to separate one name space from another. This allows there to be a login known as user@dom1.com and a login known as user@dom2.com. Under ZipDial, it also allows us to segment customer logins, so authentications go to the approriate RADIUS server(s). A domain is registered with the InterNIC, and used for mapping servers and services to IP addresses, such as Web, e-mail, etc. A domain has no real relationship to a RADIUS realm except in that a ZipDial realm is often the same as a ZipDial customer’s domain. However, there is no requirement for this, and in fact we often assign realms with no top level domain (user@dom1 — so no “.com”) or through an acronym or some modification of service name (user@isp). A realm can also be prefixed to usernames by using a “/” (so one would use ISP/user). Whether to use a full domain or abbreviated form of one for a realm, or to have a prefixed or suffixed realm, is up to the ZipDial customer. • What is the format of a VPHos
