Security Configuration Guide: Zone-Based Policy Firewall, Cisco IOS Release 15M&T
H.323 RAS Support
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H.323 RAS Support

H.323 RAS Support

This feature introduces support for H.225 Registration, Admission, and Status (RAS) signaling in zone-based firewalls. RAS is a signaling protocol that is used between endpoints (such as gateways) and gatekeepers.

The H.225 standard is used by H.323 for call setup. H.255 includes RAS control, which is used to communicate with the gatekeeper. A RAS signaling channel enables connections between the gatekeeper and H.323 endpoints.

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 at the end of this module.

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.

Restrictions for H.323 RAS Support

H.225 RAS inspection is supported only with zone-based policy firewall inspection.

How to Configure H.323 RAS Support

Configuring a Class Map for H.323 RAS Protocol Inspection

Use this task to configure a class map for classifying network traffic.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    class-map type inspect [match-any | match-all] class-map-name

    4.    match access-group {access-group | name access-group-name}

    5.    match protocol protocol-name [signature]

    6.    match protocol protocol-name [signature]

    7.    match class-map class-map-name

    8.    exit


DETAILED STEPS
     Command or ActionPurpose
    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 class-map type inspect [match-any | match-all] class-map-name


    Example:
    Router(config)# class-map type inspect match-all c1 
     

    Creates a Layer 3 or Layer 4 inspect type class map and enters class-map configuration mode.

     
    Step 4 match access-group {access-group | name access-group-name}


    Example:
    Router(config-cmap)# match access-group 101 
     

    (Optional) Configures the match criterion for a class map based on the access control list (ACL) name or number.

     
    Step 5 match protocol protocol-name [signature]


    Example:
    Router(config-cmap)# match protocol h225ras 
     

    Configures the match criterion for a class map on the basis of a specified protocol.

    Note   

    You should specify the h225ras keyword to create a class-map for H.225 RAS protocol classification. For a list of supported protocols, use the command-line interface (CLI) help option (?) on your platform.

     
    Step 6 match protocol protocol-name [signature]


    Example:
    Router(config-cmap)# match protocol h323
     

    Configures the match criterion for a class map on the basis of a specified protocol.

    Note   

    You should specify the h323 keyword to create a class-map for H.323 protocol classification.

     
    Step 7 match class-map class-map-name


    Example:
    Router(config-cmap)# match class-map c1 
     

    (Optional) Specifies a previously defined class as the match criterion for a class map.

     
    Step 8 exit


    Example:
    Router(config-cmap)# exit 
     

    Returns to global configuration mode.

     

    Creating a Policy Map for H.323 RAS Protocol Inspection

    Use this task to create a policy map for a firewall policy that will be attached to zone pairs.


    Note


    If you are creating an inspect type policy map, only the following actions are allowed: drop, inspect, police, and pass.


    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    policy-map type inspect policy-map-name

      4.    class type inspect class-name

      5.    inspect [parameter-map-name]

      6.    police rate bps burst size

      7.    drop [log]

      8.    pass

      9.    exit


    DETAILED STEPS
       Command or ActionPurpose
      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 policy-map type inspect policy-map-name


      Example:
      Router(config)# policy-map type inspect p1 
       

      Creates a Layer 3 and Layer 4 inspect type policy map and enters policy-map configuration mode.

       
      Step 4 class type inspect class-name


      Example:
      Router(config-pmap)# class type inspect c1 
       

      Specifies the traffic (class) on which an action is to be performed and enters policy-map class configuration mode.

       
      Step 5 inspect [parameter-map-name]


      Example:
      Router(config-pmap-c)# inspect inspect-params 
       

      Enables Cisco IOS stateful packet inspection.

       
      Step 6 police rate bps burst size


      Example:
      Router(config-pmap-c)# police rate 2000 burst 3000
       

      (Optional) Limits traffic matching within a firewall (inspect) policy.

       
      Step 7 drop [log]


      Example:
      Router(config-pmap-c)# drop 
       

      (Optional) Drops packets that are matched with the defined class.

      Note   

      The actions drop and pass are exclusive, and the actions inspect and drop are exclusive; that is, you cannot specify both of them.

       
      Step 8 pass


      Example:
      Router(config-pmap-c)# pass 
       

      (Optional) Allows packets that are matched with the defined class.

       
      Step 9 exit


      Example:
      Router(config-pmap-c)# exit 
       

      Returns to policy-map configuration mode.

       

      What to Do Next

      After configuring an H.323 RAS protocol firewall policy, you want to attach the policy to a zone pair. For information on completing this task, see the “Zone-Based Policy Firewall” module.

      Configuration Examples for H.323 RAS Support

      Example H.323 RAS Protocol Inspection Configuration

      The following example shows how to configure an H.323 RAS protocol inspection policy:

      class-map type inspect match-any c1
       match protocol h323
       match protocol h225ras
      class-map type inspect match-all c2
       match protocol icmp
      !
      policy-map type inspect p1
       class type inspect c1
       inspect
       class class-default
        drop
      policy-map type inspect p2
       class type inspect c2
       inspect
       class class-default
        drop
      !
      zone security z1
       description One-Network zone
      zone security z2
       description Two-Network zone
      zone-pair security zp source z1 destination z2
       service-policy type inspect p1
      zone-pair security zp-rev source z2 destination z1
       service-policy type inspect p2
      ! 
      interface FastEthernet1/0
       ip address 10.0.0.0 255.255.0.0
       zone-member security z1
       duplex auto
       speed auto
      !
      interface FastEthernet1/1
       ip address 10.0.1.1 255.255.0.0
       zone-member security z2
       duplex auto
       speed auto

      Example H.225 RAS Firewall Policy Configuration

      The following example shows how to configure the firewall policy to inspect H.225 RAS messages:

      interface GigabitEthernet 0/1/5
       ip address 172.16.0.0 255.255.0.0
       zone-member security private
       no shut
      !
      interface GigabitEthernet 0/1/6
       ip address 192.168.0.0 255.255.0.0
       zone-member security internet
       no shut
      !
      zone security private
      zone security internet
      !
      class-map type inspect match-any internet-traffic-class
       match protocol h225ras
       match protocol h323
      !
      policy-map type inspect private-internet-policy
       class type inspect internet-traffic-class
       inspect
       class class-default
      !
      zone-pair security private-internet source private destination internet
       service-policy type inspect private-internet-policy

      Additional References for H.323 RAS Support

      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 H.323 RAS Support

      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 H.323 RAS Support

      Feature Name

      Releases

      Feature Information

      H.323 RAS Support

      12.4(11)T

      H.323 RAS Support feature introduces support for H.255 Registration, Admission, and Status (RAS) signaling in zone-based firewalls.

      The following command was introduced or modified: match protocol (zone).