Realms

A realm is logical network, similar to a domain, which defines a group of systems that are under the same master KDC. As with establishing a DNS domain name, issues such as the realm name, the number and size of each realm, and the relationship of a realm to other realms for cross-realm authentication should be resolved before you configure SEAM.

Realm Names

Realm names can consist of any ASCII string. Usually, the realm name is the same as your DNS domain name, in uppercase. This convention helps differentiate problems with SEAM from problems with the DNS namespace, while using a name that is familiar. If you do not use DNS or you choose to use a different string, then you can use any string. However, the configuration process requires more work. The use of realm names that follow the standard Internet naming structure is wise.

Number of Realms

The number of realms that your installation requires depends on several factors:

• The number of clients to be supported. Too many clients in one realm makes administration more difficult and eventually requires that you split the realm. The primary factors that determine the number of clients that can be supported are as follows:

  • The amount of SEAM traffic that each client generates

  • The bandwidth of the physical network

  • The speed of the hosts

  Since each installation will have different limitations, there is no rule for determining the maximum number of clients.

• How far apart the clients are. It might make sense to set up several small realms if the clients are in different geographic regions.

• The number of hosts that are available to be installed as KDCs. Each realm should have at least two KDC servers (master and slave).

Realm Hierarchy

When you are configuring multiple realms for cross-realm authentication, you need to decide how to tie the realms together. You can establish a hierarchical relationship between the realms that provides automatic paths to the related domains. Of course, all realms in the hierarchical chain must be configured properly. The automatic paths can ease the administration burden. However, if there are many levels of domains, you might not want to use the default path because it requires too many transactions.

You can also choose to establish the connection directly. A direct connection is most useful when too many levels exist between two hierarchical domains or when there is no hierarchal relationship. The connection must be defined in the /etc/krb5/krb5.conf file on all hosts that use the connection. So, some additional work is required. For an introduction, see Realms and for the configuration procedures for multiple realms, see Configuring Cross-Realm Authentication.