TACACS+ over IPv6

An IPv6 server can be configured to be used with TACACS+.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Information About TACACS+ over IPv6

The Terminal Access Controller Access-Control System (TACACS+) security protocol provides centralized validation of users. TACACS+ services are maintained in a database on a TACACS+ daemon typically running on a UNIX or Windows NT workstation. You must have access to and must configure a TACACS+ server before the configured TACACS+ features on your devices are available.

TACACS+ provides for separate authentication, authorization, and accounting facilities. TACACS+ allows for a single access control server (the TACACS+ daemon) to provide each service (authentication, authorization, and accounting) independently. Each service is associated with its own database to take advantage of other services available on that server or on the network, depending on the capabilities of the daemon.

AAA over IPv6

Vendor-specific attributes (VSAs) are used to support Authentication, Authorization and Accounting(AAA) over IPv6. Cisco VSAs are inacl, outacl, prefix, and route.

You can configure prefix pools and pool names by using the AAA protocol. Customers can deploy an IPv6 RADIUS server or a TACACS+ server to communicate with Cisco devices.

TACACS+ Over an IPv6 Transport

An IPv6 server can be configured to use TACACS+. Both IPv6 and IPv4 servers can be configured to use TACACS+ using a name instead of an IPv4 or IPv6 address.

How to Configure TACACS+ over IPv6

Configuring the TACACS+ Server over IPv6

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    tacacs server name

    4.    address ipv6 ipv6-address

    5.    key [0 | 7] key-string

    6.    port [number

    7.    send-nat-address

    8.    single-connection

    9.    timeout seconds


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example: 
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example: 
    Device# configure terminal
     

    Enters global configuration mode.

     
    Step 3 tacacs server name


    Example: 
    Device(config)# tacacs server server1
     

    Configures the TACACS+ server for IPv6 and enters TACACS+ server configuration mode.

     
    Step 4 address ipv6 ipv6-address


    Example: 
    Device(config-server-tacacs)# address ipv6 2001:DB8:3333:4::5
     

    Configures the IPv6 address of the TACACS+ server.

     
    Step 5 key [0 | 7] key-string


    Example: 
    Device(config-server-tacacs)# key 0 key1
     

    Configures the per-server encryption key on the TACACS+ server.

     
    Step 6 port [number


    Example: 
    Device(config-server-tacacs)# port 12
     

    Specifies the TCP port to be used for TACACS+ connections.

     
    Step 7 send-nat-address


    Example: 
    Device(config-server-tacacs)# send-nat-address
     

    Sends a client’s post-NAT address to the TACACS+ server.

     
    Step 8 single-connection


    Example: 
    Device(config-server-tacacs)# single-connection
     

    Enables all TACACS packets to be sent to the same server using a single TCP connection.

     
    Step 9 timeout seconds


    Example: 
    Device(config-server-tacacs)# timeout 10
     

    Configures the time to wait for a reply from the specified TACACS server.

     

    Specifying the Source Address in TACACS+ Packets

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    ipv6 tacacs source-interface type number


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example: 
      Device> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 2 configure terminal


      Example: 
      Device# configure terminal
       

      Enters global configuration mode.

       
      Step 3 ipv6 tacacs source-interface type number


      Example: 
      Device(config)# ipv6 tacacs source-interface Gigabitethernet 1/2/1
       

      Specifies an interface to use for the source address in TACACS+ packets.

       

      Configuring TACACS+ Server Group Options

      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    aaa group server tacacs+ group-name

        4.    server name server-name

        5.    server-private {ip-address | name | ipv6-address} [nat] [single-connection] [port port-number] [timeout seconds] [key [0 | 7] string]


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example: 
        Device> enable
         

        Enables privileged EXEC mode.

        • Enter your password if prompted.

         
        Step 2 configure terminal


        Example: 
        Device# configure terminal
         

        Enters global configuration mode.

         
        Step 3 aaa group server tacacs+ group-name


        Example: 
        Device(config)# aaa group server tacacs+ group1
         

        Groups different TACACS+ server hosts into distinct lists and distinct methods.

         
        Step 4 server name server-name


        Example: 
        Device(config-sg-tacacs+)# server name server1
         

        Specifies an IPv6 TACACS+ server.

         
        Step 5 server-private {ip-address | name | ipv6-address} [nat] [single-connection] [port port-number] [timeout seconds] [key [0 | 7] string]


        Example: 
        Device(config-sg-tacacs+)# server-private 2001:DB8:3333:4::5 port 19 key key1
         

        Configures the IPv6 address of the private TACACS+ server for the group server.

         

        Configuration Examples for TACACS+ over IPv6

        Example: Configuring TACACS+ Server over IPv6

        Device# show tacacs 

            Tacacs+ Server:          server1
            Server Address:          FE80::200:F8FF:FE21:67CF
              Socket opens:          0
             Socket closes:          0
             Socket aborts:          0
             Socket errors:          0
           Socket Timeouts:          0
   Failed Connect Attempts:          0
        Total Packets Sent:          0
        Total Packets Recv:          0

        Additional References

        Related Documents

        Related Topic

        Document Title

        IPv6 addressing and connectivity

        IPv6 Configuration Guide

        Commands

        Cisco IOS Master Command List, All Releases

        IPv6 commands

        Cisco IOS IPv6 Command Reference

        IPv6 features

        CiscoIOS_​IPv6_​Feature_​Mapping

        Standards and RFCs

        Standard/RFC

        Title

        RFCs for IPv6

        IPv6 RFCs

        Technical Assistance

        Description

        Link

        The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

        http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

        Feature Information for TACACS+ over IPv6

        The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

        Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to . An account on Cisco.com is not required.
        Table 1 Feature Information for TACACS+ over IPv6

        Feature Name

        Releases

        Feature Information

        TACACS+ over IPv6

        Cisco IOS XE 3.2SE

        The TACACS+ over IPv6 feature allows you to configure an IPv6 server to use the TACACS+ security protocol.

        In Cisco IOS XE Release 3.2SE, this feature was supported on the following platforms:

        • Catalyst 3850 Series Switches

        • Cisco 5760 Wireless LAN Controller

        The following commands were introduced or modified: aaa group server tacacs+, address ipv6 (TACACS+), ipv6 tacacs source-interface, key (TACACS+), port (TACACS+), send-nat-address, server name (IPv6 TACACS+), server-private (TACACS+), single-connection, tacacs server, timeout (TACACS+).