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 Action Purpose
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 Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

ipv6 tacacs source-interface type number

Example:


Router(config)# ipv6 tacacs source-interface GigabitEthernet 0/0/0

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 Action Purpose
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

The following sections provide references related to the MSCHAP Version 2 feature.

Related Documents

Related Topic

Document Title

Configuring PPP interfaces

PPP Configuration in the Cisco IOS Dial Technologies Configuration Guide , Release 12.4T.

Descriptions of the tasks and commands necessary to configure and maintain Cisco networking devices

Cisco IOS Dial Technologies Command Reference

Lists of IOS Security Commands

Cisco IOS Security Command Reference

Configuring PPP authentication using AAA

Configuring PPP Authentication Using AAA in the Configuring Authentication module in the Cisco IOS Security Configuration Guide: Securing User Services , Release 12.4T.

Configuring RADIUS Authentication

Configuring RADIUS module in the Cisco IOS Security Configuration Guide: Securing User Services, Release 12.4T.

Standards

Standard

Title

No new or modified standards are supported by this feature.

--

MIBs

MIB

MIBs Link

No new or modified MIBs are supported by this feature.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

RFC 1661

Point-to-Point Protocol (PPP)

RFC 2548

Microsoft Vendor-specific RADIUS Attributes

RFC 2759

Microsoft PPP CHAP Extensions, Version 2

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport

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 www.cisco.com/go/cfn. 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 Release 3.2S

TACACS+ over IPv6 is supported.

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+) .