Obtaining A Tgt From A Kdc; Authenticating To Network Services; Configuring Kerberos - Cisco Catalyst 3750 Software Configuration Manual

Chapter 7 Configuring Switch-Based Authentication

Obtaining a TGT from a KDC

This section describes the second layer of security through which a remote user must pass. The user must
now authenticate to a KDC and obtain a TGT from the KDC to access network services.
For instructions about how to authenticate to a KDC, refer to the "Obtaining a TGT from a KDC" section
in the "Security Server Protocols" chapter of the Cisco IOS Security Configuration Guide, Release 12.1,
at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/secur_c/scprt2/scdkerb.htm
#xtocid154005.

Authenticating to Network Services

This section describes the third layer of security through which a remote user must pass. The user with
a TGT must now authenticate to the network services in a Kerberos realm.
For instructions about how to authenticate to a network service, refer to the "Authenticating to Network
Services" section in the "Security Server Protocols" chapter of the Cisco IOS Security Configuration
Guide, Release 12.1, at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/secur_c/scprt2/scdkerb.htm
#xtocid154006.

Configuring Kerberos

So that remote users can authenticate to network services, you must configure the hosts and the KDC in
the Kerberos realm to communicate and mutually authenticate users and network services. To do this,
you must identify them to each other. You add entries for the hosts to the Kerberos database on the KDC
and add KEYTAB files generated by the KDC to all hosts in the Kerberos realm. You also create entries
for the users in the KDC database.
When you add or create entries for the hosts and users, follow these guidelines:
•
•
•
A Kerberos server can be a Catalyst 3750 Metro switch that is configured as a network security server
Note
and that can authenticate users by using the Kerberos Protocol.
To set up a Kerberos-authenticated server-client system, follow these steps:
•
•
For instructions, refer to the "Kerberos Configuration Task List" section in the "Security Server
Protocols" chapter of the Cisco IOS Security Configuration Guide, Release 12.1, at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/secur_c/scprt2/scdkerb.htm
#xtocid154007.
78-15870-01
The Kerberos principal name must be in all lowercase characters.
The Kerberos instance name must be in all lowercase characters.
The Kerberos realm name must be in all uppercase characters.
Configure the KDC by using Kerberos commands.
Configure the switch to use the Kerberos protocol.
Controlling Switch Access with Kerberos
Catalyst 3750 Metro Switch Software Configuration Guide
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