Motorola AP-51XX - Manual (Page 228)

AP-51xx Access Point Product Reference Guide 6-10
5. Set the Kerberos Configuration field as required to define the parameters of the Kerberos
authentication server and access point.
Realm Name Specify a realm name that is case-sensitive, for example,
MOTOROLA.COM. The realm name is the name domain/realm
name of the KDC Server. A realm name functions similarly to a DNS
domain name. In theory, the realm name is arbitrary. However, in
practice a Kerberos realm is named by uppercasing the DNS
domain name that is associated with hosts in the realm.
Primary KDC Specify a numerical (non-DNS) IP address and port for the primary
Key Distribution Center (KDC). The KDC implements an
Authentication Service and a Ticket Granting Service, whereby an
authorized user is granted a ticket encrypted with the user's
password. The KDC has a copy of every user password.