Cisco IOS Software Configuration Guide for Cisco Aironet Access ...

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Configuring a Local Authenticator Chapter 9 Configuring an Access Point as a Local Authenticator In this example, the local authenticator generates a PAC for the username joe, password-protects the file with the password bingo, sets the PAC to expire in 10 days, and writes the PAC file to the TFTP server at 10.0.0.5: AP# radius local-server pac-generate tftp://10.0.0.5 joe password bingo expiry 10 Configuring an Authority ID All EAP-FAST authenticators are identified by an authority identity (AID). The local authenticator sends its AID to an authenticating client, and the client checks its database for a matching AID. If the client does not recognize the AID, it requests a new PAC. Use these commands to assign an AID to the local authenticator: AP(config-radserv)# [no] eapfast authority id identifier AP(config-radserv)# [no] eapfast authority info identifier The eapfast authority id command assigns an AID that the client device uses during authentication. Configuring Server Keys The local authenticator uses server keys to encrypt PACs that it generates and to decrypt PACs when authenticating clients. The server maintains two keys, a primary key and a secondary key, and uses the primary key to encrypt PACs. By default, the server uses a default value as the primary key but does not use a secondary key unless you configure one. When the local authenticator receives a client PAC, it attempts to decrypt the PAC with the primary key. If decryption fails with the primary, the authenticator attempts to decrypt the PAC with the secondary key if one is configured. If decryption fails, the authenticator rejects the PAC as invalid. Use these commands to configure server keys: AP(config-radsrv)# [no] eapfast server-key primary {[auto-generate] | [ [0 | 7] key]} AP(config-radsrv)# [no] eapfast server-key secondary [0 | 7] key Keys can contain up to 32 hexadecimal digits. Enter 0 before the key to enter an unencrypted key. Enter 7 before the key to enter an encrypted key. Use the no form of the commands to reset the local authenticator to the default setting, which is to use a default value as a primary key. Possible PAC Failures Caused by Access Point Clock The local authenticator uses the access point clock to both generate PACs and to determine whether PACs are valid. However, relying on the access point clock can lead to PAC failures. If your local authenticator access point receives its time setting from an NTP server, there is an interval between boot up and synchronization with the NTP server during which the access point uses its default time setting. If the local authenticator generates a PAC during that interval, the PAC might be expired when the access point receives a new time setting from the NTP server. If an EAP-FAST client attempts to authenticate during the interval between boot and NTP-synch, the local authenticator might reject the client’s PAC as invalid. If your local authenticator does not receive its time setting from an NTP server and it reboots frequently, PACs generated by the local authenticator might not expire when they should. The access point clock is reset when the access point reboots, so the elapsed time on the clock would not reach the PAC expiration time. 9-8 Cisco IOS Software Configuration Guide for Cisco Aironet Access Points OL-8191-01
Chapter 9 Configuring an Access Point as a Local Authenticator Configuring a Local Authenticator Limiting the Local Authenticator to One Authentication Type By default, a local authenticator access point performs LEAP, EAP-FAST, and MAC-based authentication for client devices. However, you can limit the local authenticator to perform only one or two authentication types. Use the no form of the authentication command to restrict the authenticator to an authentication type: AP(config-radsrv)# [no] authentication [eapfast] [leap] [mac] Because all authentication types are enabled by default, you enter the no form of the command to disable authentication types. For example, if you want the authenticator to perform only LEAP authentication, you enter these commands: AP(config-radsrv)# no authentication eapfast AP(config-radsrv)# no authentication mac Unblocking Locked Usernames You can unblock usernames before the lockout time expires, or when the lockout time is set to infinite. In Privileged Exec mode on the local authenticator, enter this command to unblock a locked username: AP# clear radius local-server user username Viewing Local Authenticator Statistics In privileged exec mode, enter this command to view statistics collected by the local authenticator: AP# show radius local-server statistics This example shows local authenticator statistics: Successes : 0 Unknown usernames : 0 Client blocks : 0 Invalid passwords : 0 Unknown NAS : 0 Invalid packet from NAS: 0 NAS : 10.91.6.158 Successes : 0 Unknown usernames : 0 Client blocks : 0 Invalid passwords : 0 Corrupted packet : 0 Unknown RADIUS message : 0 No username attribute : 0 Missing auth attribute : 0 Shared key mismatch : 0 Invalid state attribute: 0 Unknown EAP message : 0 Unknown EAP auth type : 0 Auto provision success : 0 Auto provision failure : 0 PAC refresh : 0 Invalid PAC received : 0 Username Successes Failures Blocks nicky 0 0 0 jones 0 0 0 jsmith 0 0 0 Router#sh radius local-server statistics Successes : 1 Unknown usernames : 0 Client blocks : 0 Invalid passwords : 0 Unknown NAS : 0 Invalid packet from NAS: 0 The first section of statistics lists cumulative statistics from the local authenticator. OL-8191-01 Cisco IOS Software Configuration Guide for Cisco Aironet Access Points 9-9
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Cisco IOS Software Configuration Gu
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CONTENTS Preface xix Audience xix P
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Contents Opening the CLI with Secur
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Contents Optional ARP Caching 5-26
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Contents Guidelines for Using Multi
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Contents Applying an EAP Profile to
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Contents Assigning Names to VLANs 1
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Contents Verifying Repeater Operati
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Contents Displaying the Logging Con
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Preface Audience This guide is for
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Preface Conventions Appendix B, “
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Preface Related Publications ¡Adve
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Preface Documentation Feedback Cisc
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Preface Obtaining Technical Assista
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CHAPTER 1 Overview Cisco Aironet Ac
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Chapter 1 Overview Features WLSM Su
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Chapter 1 Overview Features VoWLAN
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Chapter 1 Overview Features • Wi-
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Chapter 1 Overview Management Optio
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Chapter 1 Overview Network Configur
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Chapter 1 Overview Network Configur
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CHAPTER 2 Using the Web-Browser Int
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Chapter 2 Using the Web-Browser Int
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CHAPTER 3 Using the Command-Line In
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Chapter 3 Using the Command-Line In
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CHAPTER 4 Configuring the Access Po
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Chapter 4 Configuring the Access Po
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CHAPTER 5 Administering the Access
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Chapter 5 Administering the Access
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CHAPTER 6 Configuring Radio Setting
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Chapter 6 Configuring Radio Setting
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Chapter 12 Configuring WDS, Fast Se
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CHAPTER 13 Configuring RADIUS and T
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Chapter 13 Configuring RADIUS and T
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CHAPTER 14 Configuring VLANs This c
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Chapter 14 Configuring VLANs Unders
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Chapter 14 Configuring VLANs Config
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Chapter 14 Configuring VLANs VLAN C
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Chapter 14 Configuring VLANs VLAN C
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CHAPTER 15 Configuring QoS This cha
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Chapter 15 Configuring QoS Understa
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Chapter 15 Configuring QoS Configur
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Chapter 15 Configuring QoS QoS Conf
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CHAPTER 16 Configuring Filters This
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Chapter 16 Configuring Filters Conf
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CHAPTER 17 Configuring CDP This cha
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Chapter 17 Configuring CDP Configur
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Chapter 17 Configuring CDP Monitori
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Chapter 17 Configuring CDP Monitori
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CHAPTER 18 Configuring SNMP This ch
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Chapter 18 Configuring SNMP Underst
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Chapter 18 Configuring SNMP Configu
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CHAPTER 19 Configuring Repeater and
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Chapter 19 Configuring Repeater and
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SP ED LED 1 5 2 6 3 7 4 8 1X 2X ETH
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20 CHAPTER Managing Firmware and Co
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Chapter 20 Managing Firmware and Co
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21 CHAPTER Configuring System Messa
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Chapter 21 Configuring System Messa
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22 CHAPTER Troubleshooting This cha
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Chapter 22 Troubleshooting Checking
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Chapter 22 Troubleshooting Resettin
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Chapter 22 Troubleshooting Reloadin
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APPENDIX A Protocol Filters The tab
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Appendix A Protocol Filters Table A
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Appendix A Protocol Filters Table A
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APPENDIX B Supported MIBs This appe
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APPENDIX C Error and Event Messages
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Appendix C Error and Event Messages
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GLOSSARY 802.11 The IEEE standard t
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Glossary dipole domain name DNS DSS
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Glossary roaming RP-TNC A feature o
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INDEX Numerics 1130AG series indica
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Index Telnet 4-9 terminal emulator
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Index reasons for 20-18 using FTP 2
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Index IP redirection 7-11, 7-12 IPS
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Index protected ports 6-25 protocol
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Index server groups 18-7 shutdown m
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Index tftp_init command 22-21 TFTP
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