Configuring an FQDN ACL

This document describes how to configure an access control lists (ACL) using a fully qualified domain name (FQDN). The Configuring an FQDN ACL feature allows you to configure and apply an ACL to a wireless session based on the domain name system (DNS). The domain names are resolved to IP addresses, the IP addresses are given to the client as part of the DNS response, and the FQDN is then mapped to an ACL based on the IP address.

Finding Feature Information

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Restrictions for Configuring FQDN ACL

The Configuring FQDN ACL feature is supported only on IPv4 wireless sessions.

Information About Configuring an FQDN ACL

Configuring an FQDN ACL

When access control lists (ACLs) are configured using a fully qualified domain name (FQDN), ACLs can be applied based on the destination domain name. The destination domain name is then resolved to an IP address, which is provided to the client as a part of the DNS response.

Guest users can log in using web authentication with a parameter map that consists of an FQDN ACL name.

Before you configure an FQDN ACL, complete the following tasks:

  • Configure an IP access list.

  • Configure an IP domain name list.

  • Map an FQDN ACL with a domain name.

You can apply an access list to a specific domain by configuring the RADIUS server to send the fqdn-acl-name AAA attribute to the controller. The operating system checks for the passthrough domain list and its mapping, and permits the FQDN. The FQDN ACL allows clients to access only configured domains without authentication.


Note
By default, an IP access list name is configured with the same name as the pass-through domain name. To override the default name, you can use the access-session passthrou-access-group access-group-name passthrou-domain-list domain-list-name command in global configuration mode.

How to Configure FQDN ACL

Configuring an IP Access List

SUMMARY STEPS

    1.    configure terminal

    2.    ip access-list extended name

    3.    permit ip any any

    4.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 configure terminal


    Example: 
    # configure terminal
     

    Enters global configuration mode.

     
    Step 2 ip access-list extended name


    Example: 
    (config)# ip access-list extended ABC
     

    Creates the IP access list.

     
    Step 3 permit ip any any


    Example: 
    (config-ext-nacl)# permit ip any any
     

    Specifies the domains to be allowed for the wireless client. The domains are specified in the domain name list.

     
    Step 4end


    Example:
    (config)# end
     

    Returns to privileged EXEC mode. Alternatively, you can also press Ctrl-Z to exit global configuration mode.

     

    Configuring a Domain Name List

    You can configure a domain name list that contains a list of domain names that are allowed for DNS snooping by the access point. The DNS domain list name string must be identical to the extended access list name.

    SUMMARY STEPS

      1.    configure terminal

      2.    passthrou-domain-list name

      3.    match word

      4.    end


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 configure terminal


      Example: 
      # configure terminal
       

      Enters global configuration mode.

       
      Step 2 passthrou-domain-list name


      Example: 
      (config)# passthrou-domain-list abc
(config-fqdn-acl-domains)#
       

      Configures a passthrough domain name list.

       
      Step 3 match word


      Example: 
      (config-fqdn-acl-domains)# match play.google.com
(config-fqdn-acl-domains)# match www.yahoo.com
       

      Configures a passthrough domain list. Adds a list of websites that the client is allowed to query for access without first being required to be authenticated through the RADIUS server.

       
      Step 4end


      Example:
      (config)# end
       

      Returns to privileged EXEC mode. Alternatively, you can also press Ctrl-Z to exit global configuration mode.

       

      Mapping the FQDN ACL with a Domain Name

      SUMMARY STEPS

        1.    configure terminal

        2.    access-session passthrou-access-group access-group-name passthrou-domain-list domain-list-name

        3.    parameter-map type webauth domain-list-name and login-auth-bypass fqdn-acl-name acl-name domain-name domain-name


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 configure terminal


        Example: 
        # configure terminal
         

        Enters global configuration mode.

         
        Step 2 access-session passthrou-access-group access-group-name passthrou-domain-list domain-list-name


        Example: 
        (config)# access-session passthrou-access-group abc passthrou-domain-list abc
         

        Maps the FQDN ACL AAA attribute name with the domain name list. Use this command when configuring central web authentication.

         
        Step 3 parameter-map type webauth domain-list-name and login-auth-bypass fqdn-acl-name acl-name domain-name domain-name


        Example: 
        (config)# parameter-map type webauth abc
(config-params-parameter-map)# login-auth-bypass fqdn-acl-name abc domain-name abc
         

        Maps an FQDN ACL name with the domain name list. Use the command when configuring local authentication on the controller.

        The RADIUS server can be configured to return an FQDN ACL name as part of the authenticated user profile. The controller dynamically applies the FQDN ACL to the user if the FQDN ACL is defined on the controller.

         

        Monitoring an FQDN ACL

        The following commands can be used to monitor FQDN ACLs.

        Command

        Purpose

        show access-session interface interface-name details

        Displays the FQDN ACL information configured on the interface.

        show access-session fqdn fqdn-maps

        Displays the FQDN ACL mapped to the domain name list.

        show access-session fqdn list-domain domain-name

        Displays the domain names.

        show access-session fqdn passthru-domain-list

        Displays the domains that are configured.

        Configuration Examples for an FQDN ACL

        Examples: FQDN ACL Configuration

        This example shows how to create IP access list: 
        # config terminal
(config)# ip access-list extended abc
(config-ext-nacl)# permit ip any any
(config-ext-nacl)# end
# show ip access-list abc
        This example shows how to configure domain name list: 
        # config terminal
(config)# passthrou-domain-list abc
(config-fqdn-acl-domains)# match play.google.com
(config-fqdn-acl-domains)# end
# show access-session fqdn fqdn-maps
        This example shows how to map FQDN ACL with domain name using central web authentication: 
        # config terminal
(config)# access-session passthrou-access-group abc passthrou-domain-list abc
(config)# end
# show access-session interface vlan 20
        This example shows how to map FQDN ACL with domain name using local authentication: 
        # config terminal
(config)# parameter-map type webauth abc
(config-params-parameter-map)# login-auth-bypass fqdn-acl-name abc domain-name abc
(config-params-parameter-map)# end
# show access-session fqdn fqdn-maps

        Additional References for Configuring FQDN ACL

        Related Documents

        Related Topic

        Document Title

        Cisco IOS commands

        Cisco IOS Master Command List, All Releases

        Security commands

        ACL configuration guide

        Security Configuration Guide: Access Control Lists

        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 Configuring FQDN ACL

        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 Configuring FQDN ACL

        Feature Name

        Releases

        Feature Information

        Configuring an FQDN ACL

        Cisco IOS XE 3.6E

        The Configuring an FQDN ACL feature allows you to configure and apply an access control lists (ACL) to a wireless session based on the domain name system (DNS). The domain names are resolved to IP addresses, where the IP addresses are given to the client as part of the DNS response; the FQDN is then mapped to an ACL based on the IP address.

        In Cisco IOS XE Release 3.6E, this feature is supported on Cisco Catalyst 3850 Series Switches.

        The following commands were introduced or modified: access session passthrou access group, login-auth-bypass, parameter-map type webauth global, pass throu domain list name, show access-session fqdn.