Cisco IOS Security Configuration Guide: Securing User Services, Release 12.4

ACL Default Direction

The ACL Default Direction feature allows the filter direction to be changed on the server (where the filter direction is not specified) to inbound packets (packets coming into the network) only.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see 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 for ACL Default Direction" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp. An account on Cisco.com is not required.

Contents

•Prerequisites for ACL Default Direction

•Information About ACL Default Direction

•How to Configure ACL Default Direction

•Configuration Examples for ACL Default Direction

•Additional References

•Feature Information for ACL Default Direction

Prerequisites for ACL Default Direction

Before you can change the default direction of filters from RADIUS, you must perform the following tasks:

•Configure your network access server (NAS) for authentication, authorization, and accounting (AAA) and to accept incoming calls.

For more information, refer to the AAA chapters of the Cisco IOS Security Configuration Guide: Securing User Services, Release 12.4T and the Cisco IOS Dial Technologies Configuration Guide, Release 12.4T.

•Create a filter on your NAS.

For more information, see Cisco IOS IP Addressing Services Configuration Guide, Release 12.4T.

•Add a filter definition for a RADIUS user; for example, Filter-Id = "myfilter".

Information About ACL Default Direction

Before changing the default direction of filters for your access control lists (ACLs) from RADIUS, you should understand the following concepts:

•The radius-server attribute 11 direction default Command

•Benefits of ACL Default Direction

The radius-server attribute 11 direction default Command

The radius-server attribute 11 direction default command allows you to change the default direction of filters for your ACLs via RADIUS. (RADIUS attribute 11 (Filter-Id) indicates the name of the filter list for the user.) Enabling this command allows you to change the filter direction to inbound—which stops traffic from entering a router, and reduces resource consumption—rather than keeping the outbound default direction, where filtering occurs only as the traffic is about to leave the network.

Benefits of ACL Default Direction

The ACL Default Direction feature allows you to change the default direction, which is outbound, of filters for your ACLs to inbound via the radius-server attribute 11 direction default command.

How to Configure ACL Default Direction

This section contains the following procedures:

•Configuring the ACL Default Direction from RADIUS via Attribute 11 (Filter-Id) (required)

•Verifying the ACL Default Direction from RADIUS via Attribute 11 (Filter-Id) (optional)

Configuring the ACL Default Direction from RADIUS via Attribute 11 (Filter-Id)

Perform this task to configure the default direction of filters from RADIUS via attribute 11.

SUMMARY STEPS

1. enable

2. configure terminal

3. radius-server attribute 11 direction default [inbound | outbound]

DETAILED STEPS

Verifying the ACL Default Direction from RADIUS via Attribute 11 (Filter-Id)

Perform this task to verify the default direction of filters from RADIUS and to verify that RADIUS attribute 11 is being sent in access accept requests.

SUMMARY STEPS

1. enable

2. more system:running-config

3. debug radius

DETAILED STEPS

Configuration Examples for ACL Default Direction

This section provides the following configuration examples:

•Default Direction of Filters via RADIUS Attribute 11 (Filter-Id): Example

•RADIUS User Profile with Filter-Id: Example

Default Direction of Filters via RADIUS Attribute 11 (Filter-Id): Example

The following example shows how to configure RADIUS attribute 11 to change the default direction of filters. In this example, the filtering is applied to inbound packets only.

radius-server attribute 11 direction default inbound

RADIUS User Profile with Filter-Id: Example

The following is an example of a RADIUS user profile (Merit Daemon format) that includes RADIUS attribute 11 (Filter-Id):

client Password = "password1"

        Service-Type = Framed,

        Framed-Protocol = PPP,

        Filter-Id = "myfilter.out"

The RADIUS user profile shown in this example produces the following reply from the NAS:

RADIUS: Send to unknown id 79 10.51.13.4:1645, Access-Request, len 85

RADIUS: authenticator 84 D3 B5 7D C2 5B 70 AD - 1E 5C 56 E8 3A 91 D0 6E

RADIUS: User-Name           [1]   8  "client"

RADIUS: CHAP-Password       [3]   19  *

RADIUS: NAS-Port            [5]   6   20030

RADIUS: NAS-Port-Type       [61]  6   ISDN                      [2]

RADIUS: Called-Station-Id   [30]  6   "4321"

RADIUS: Calling-Station-Id  [31]  6   "1234"

RADIUS: Service-Type        [6]   6   Framed                    [2]

RADIUS: NAS-IP-Address      [4]   6   10.1.73.74

RADIUS: Received from id 79 10.51.13.4:1645, Access-Accept, len 46

RADIUS: authenticator 9C 6C 66 E2 F1 42 D6 4B - C1 7D D4 5E 9D 09 BB A1

RADIUS: Service-Type        [6]   6   Framed                    [2]

RADIUS: Framed-Protocol     [7]   6   PPP                       [1]

RADIUS: Filter-Id           [11]  14

RADIUS: 6D 79 66 69 6C 74 65 72 2E 6F 75 74              [myfilter.out]

Additional References

The following sections provide references related to the ACL Default Direction feature.

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for ACL Default Direction

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

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