Realm extraction

[Dmitry Alekhin]

Hi all,

I am new in free radius , so I have one question: How can I exctract Realm attribute in
radiusd.conf name?
So, I need to use it in LDAP filter to make search like :
ldap    {
                server = "localhost"
                identity = "uid=pr,ou=Staff,dc=domain,dc=com"
                password = secret
                basedn = "ou=People,dc=ivoho,dc=com"



                filter = "(uid=%{User-Name},ou=%{Realm-Name})"
                # base_filter = "(objectclass=radiusprofile)"

...


how can I get Realm-Name variable ?