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Radius server determines which server a request must be forwarded to
by request's authentication realm. There are three kinds of
realms:
- A Named Realm is the part of a user name following the
`at sign' (`@'). For example, if the user name is
`jsmith@this.net', then `this.net' is the realm.
The named realms can be cascaded, e.g. a request with user name
`jsmith@this.net@remote.net' will first be forwarded to
the radius server of realm `remote.net', which in turn
will forward it to `this.net'.
- A Default Realm defines the server to which the requests
for realms, not mentioned explicitly in the configuration,
are forwarded.
- An Empty Realm defines the server to which the requests
without explicit named realm are forwarded. If the configuration
does not define the empty realm, such requests are processed by the
server itself.
GNU Radius keeps the information about the realms it serves in
configuration file `raddb/realms' (see section List of Proxy Realms -- `raddb/realms').
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