# Content Filtering Server Group Configuration Mode Commands

Content Filtering Server Group Configuration Mode sets the parameters for interoperating with a group of external servers. It is accessed by entering the content-filtering server-group command in the Context Configuration Mode.

IMPORTANT:

The commands or keywords/variables that are available are dependent on platform type, product version, and installed license(s).
connection retry-timeout

Configures the TCP connection retry timer for Internet Content Adaptation Protocol (ICAP) server and client.
Platform:

ASR 5000
Product:

CF
Privilege:

Security Administrator, Administrator
Syntax

    connection retry-timeout duration{ default | no } connection
    retry-timeout

default

Configures the default setting of 30 seconds.
no

Removes the connection retry timeout configuration.
duration

Specifies the duration (in seconds) as an integer from 1 to 3600. Default: 30
Usage:

Use this command to configure the connection retry timer between ICAP server and client TCP connection, i.e. how long to wait before re-attempting to establish a TCP connection.
Example:
The following command sets the ICAP client and server connection retry timer to 120 seconds:

    connection retry-timeout 120

deny-message

Configures the text message that is returned to the subscriber in a deny response.
Platform:

ASR 5000
Product:

IMPORTANT:

This command is obsolete in 10.0 and later releases.

CF
Privilege:

Security Administrator, Administrator
Syntax

    deny-message string{ default | no } deny-message

default

Configures the default setting of Disabled.
no

Removes previously configured deny message setting.
string

Specifies a text message that is to be returned to the subscriber in a deny response as an alphanumeric string of 1 through 511 characters.
Usage:

Use this command to define a text message that is returned to the subscriber in a deny response.
Example:
The following command sets the text message to no_Authorization in a deny message:

    deny-message no_Authorization

deny-response code

Configures the deny response message that is to be sent from the ICAP server to the subscribers.
Platform:

ASR 5000
Product:

ICAP
Privilege:

Security Administrator, Administrator
Syntax

    deny-response code { 200
    message string | 403 }{ default | no } deny-response code

default

Configures the default setting of deny-response code 200.
no

Removes previously configured deny response message setting.
deny-response code 200 message string

Specifies a text message that is to be returned to the subscriber in a code 200 deny response. as an alphanumeric string of 1 through 511 characters.

If deny-response code 200 is configured, the response sent to the subscriber will be of the form 200 OK with deny messages denied. If a message is configured for response code 200, that message will be used instead of "Access denied".
deny-response code 403

This keyword is used to set response code 403 for the deny response message.

When this keyword is configured, the deny response from the ICAP server will be sent “as is” to the subscriber.
Usage:

Use this command to define a text message that is returned to the subscriber in a deny response.
Example:
The following command sets the text message to Not allowed in a deny response message:

    deny-response code
    200 message Not allowed

dictionary

Specifies the dictionary to use for requests to the server(s) in this Content Filtering Server Group (CFSG).
Platform:

ASR 5000
Product:

CF
Privilege:

Security Administrator, Administrator
Syntax

    dictionary { custom1 | custom2 | standard }{ default | no } dictionary

default

Sets the default dictionary.

Default: default
no

Removes the previously configured dictionary setting.
custom1

Specifies a custom-defined dictionary that conforms to TS 32.015 v 3.6.0 for R99. It provides proprietary header fields for MSISDN and APN/subscriber. Please contact your local Cisco representative for more information.
custom2

Custom-defined dictionary. Please contact your local Cisco representative for additional information.
standard

Default: Enabled

This dictionary uses an HTTP Get Request to specify the URL. It conforms to TS 32.215 v 4.6.0 for R4 (and also R5 - extended QoS format).
Usage:

Use this command to specify the standard and customized encoding mechanism used for elements included messages.
Example:
The following command configures the system to use standard dictionary to encode messages:

    default dictionary

end

Exits the current configuration mode and returns to the Exec mode.
Product:

All
Privilege:

Security Administrator, Administrator
Syntax

    end

Usage:

Use this command to return to the Exec mode.
exit

Exits the current mode and returns to the parent configuration mode.
Product:

All
Privilege:

Security Administrator, Administrator
Syntax

    exit

Usage:

Use this command to return to the parent configuration mode.
failure-action

Specifies the actions to be taken when communication between ICAP endpoints within this Content Filtering Server Group (CFSG) fail.
Platform:

ASR 5000
Product:

CF
Privilege:

Security Administrator, Administrator
Syntax

    failure-action { allow | content-insertion content_string | discard
     | redirect-url url | terminate-flow }{ default | no } failure-action

default

Configures the default setting of terminate-flow.
no

Removes previously configured failure action.
allow

For static content filtering, this option allows the request for content. In dynamic content filtering, it allows the content itself.
content-insertion content_string

Specifies the content string to be used for failure action.

For static content filtering, the specified text is used to create a response to the subscriber’s attempt to get content. In dynamic content filtering, the specified text replaces the content returned by a server.

content_string must be an alphanumeric string of 1 through 128 characters.
discard

For static content filtering, this option discards the packet(s) requested. In dynamic content filtering, it discards the packet(s) that contain(s) the content.
redirect-url url

Redirects the subscriber to the specified URL.

url must be an alphanumeric string of 1 through 128 characters in the following format: http://search.com/subtarg=#HTTP.URL#
terminate-flow

For TCP, gracefully terminates the connection between the subscriber and external server, and sends a TCP FIN to the subscriber and a TCP RST to the server.

For WAP-Connection Oriented, the WSP session is gracefully terminated by sending WTP Aborts for each of the outstanding requests, and WSP Disconnect to the client and the server. For WSP-Connectionless, only the current WSP request is rejected.
Usage:

Use this command to set the actions on failure for server connection.

ICAP rating is enabled for retransmitted packets when the default ICAP failure action was taken on an ICAP request for that flow. ICAP default failure action is taken on the pending ICAP request for a connection when the connection needs to be reset and there is no other redundant connection available. For example, in the ICAP request timeout and ICAP connection timeout scenarios, the retransmitted packet in the uplink direction is sent for ICAP rating again.

For WAP CO, uplink retransmitted packets for the WAP transactions for which ICAP failure action was taken will be sent for ICAP rating. The WSP header of the retransmitted packet is not parsed by the WSP analyzer. The URL received in the previous packet for that transaction is used for ICAP rating. If failure action was taken on multiple WTP transactions for the same flow (case: WTP concatenated GET request), the uplink retransmitted packet for each of the transactions is sent for rating again.

For HTTP, uplink retransmitted packets for the HTTP flow on which ICAP failure action is taken are sent for ICAP rating. The URL present in the current secondary session (last uplink request) is used for ICAP rating. However, if there were multiple outstanding ICAP requests for the same flow (pipelined request), the retransmitted packet for the URL sent for rating will be that of the last GET request.

Retransmission in various cases of failure-action taken on retransmitted packets when the ICAP response is not received for the original request and the retransmitted request comes in:

- WSP CO:
  - Permit: The uplink packet is sent for ICAP rating and depending on the ICAP response the WTP transaction is allowed/blocked. It is possible that the WAP gateway sends the response for the permitted GET request. Hence, there is a race condition and the subscriber may be able to view the web page even thought the rating was redirect or content insert.
  - Content Insert: The retransmitted packet is not sent for ICAP rating.
  - Redirect: The retransmitted packet is not sent for ICAP rating.
  - Discard: The uplink packet is sent for ICAP rating and depending on the ICAP response the WTP transaction is allowed/blocked.
  - Terminate flow: The uplink packet is sent for ICAP rating and depending on the ICAP response the WTP transaction is allowed or blocked. The WAP gateway may send an Abort transaction for this GET request if the WSP disconnect packet sent while terminating the flow is received by the WAP gateway.
- HTTP:
  - Permit: The uplink packet is sent for ICAP rating and depending on the ICAP response the last HTTP GET request. It is possible that the HTTP server sends the response for the permitted GET request. Hence there is a race condition and the subscriber may be able to view the web page even thought the rating was redirect or content insert.
  - Content Insert: Retransmitted packets are dropped and not charged.
  - Redirect: Retransmitted packets are dropped and not charged.
  - Discard: The uplink packet is sent for ICAP rating and depending on the ICAP response the WTP transaction allowed/blocked.
  - Terminate flow: Retransmitted packets will be dropped and not charged.

Example:
The following command sets the failure action to terminate:

    failure-action terminate-flow

icap server

Adds an Internet Content Adaptation Protocol (ICAP) server configuration to the current Content Filtering Server Group (CFSG).

IMPORTANT:

In 8.1 and later releases, a maximum of five ICAP servers can be configured per Content Filtering Server Group. In 8.0 and earlier releases, only one ICAP Server can be configured per Content Filtering Server Group.
Platform:

ASR 5000
Product:

CF
Privilege:

Security Administrator, Administrator
Syntax

    icap server ip_address [ port port_number ] [ max messages ] [ priority priority ]no icap server ip_address [ port port_number ] [ priority priority ]

no

Removes the specified ICAP server configuration from the current Content Filtering Server Group.
ip_address

Specifies the ICAP server’s IP address in IPv4 dotted-decimal or IPv6 colon-separated-hexadecimal notation.
port port_number

Specifies the ICAP server’s port number to use for communications as an integer from 1 to 65535. Default: 1344
max messages

Specifies the maximum number of unanswered outstanding messages that may be allowed to the ICAP server as an integer from 1 to 4096. Default: 256

IMPORTANT:

The maximum outstanding requests per ICAP connection is limited to one. Therefore the value configured using the max keyword will be ignored.
priority priority

Specifies priority of the ICAP server in the current Content Filtering Server Group. The priority is used in server selection to determine which standby server becomes active. priority must be an integer from 1 (highest priority) to 65535 (lowest priority). Default: 1

IMPORTANT:

The priority keyword is only available in 8.1 and later releases.
Usage:

This command is used to add an ICAP server configuration to a Content Filtering Server Group with which the system is to communicate for content filtering communication.

In 8.0, the ICAP solution supports only one connection between ACS Manager and ICAP server.

In 8.1, multiple ICAP server connections are supported per manager. At any time only one connection is active with the other connections acting as standby. In case of a connection failure, based on its priority, a standby connection becomes active. Any pending ICAP requests are moved to the new active connection. If a standby connection is unavailable, failure action is taken on all pending ICAP requests. See the failure-action command.

In 8.1 and later releases, a maximum of five ICAP servers can be configured per Content Filtering Server Group with a priority associated with each server. Once configured, an ICAP server’s priority cannot be changed. To change a server’s priority, the server configuration must be removed, and added with the new priority.
Example:
The following command sets the ICAP server IP address to 10.2.3.4 and port to 1024:

    icap server 10.2.3.4
    port 1024

The following command specifies an ICAP server with IP address 10.6.7.8, port number 1024, and priority 3:

    icap server 10.6.7.8
    port 1024 priority 3

origin address

Specifies a bind address for the Content Filtering Server Group (CFSG) endpoint.
Platform:

ASR 5000
Product:

CF
Privilege:

Security Administrator, Administrator
Syntax

    origin address ip_addressno origin address

no

Disables/releases the binding address for the CFSG endpoint.
ip_address

Specifies the IP address to bind the CFSG endpoint in IPv4 dotted-decimal or IPv6 colon-separated-hexadecimal notation.
Usage:

Use this command to set the bind address for the CFSG endpoint.
Example:
The following command sets the origin address of 10.1.1.1:

    origin address 10.1.1.1

response-timeout

Sets the response timeout for the ICAP connection between the ICAP server and client.
Platform:

ASR 5000
Product:

CF
Privilege:

Security Administrator, Administrator
Syntax

    response-timeout duration{ default | no } response-timeout

default

Configures the default setting of 30 seconds.
no

Removes the response timeout configuration.
duration

Specifies the timeout duration (in seconds) as an integer from 1 to 300. Default: 30
Usage:

Use this command to set the ICAP connection response timeout, after which connection will be marked as unsuccessful between ICAP endpoint.
Example:
The following command sets the ICAP connection response timeout to 100 seconds:

    response-timeout 100

timeout action

This command has been deprecated, and is replaced by the failure-action command.
url-extraction

Enables configuration of ICAP URL extraction behavior.
Platform:

ASR 5000
Product:

CF
Privilege:

Security Administrator, Administrator
Syntax

    url-extraction { after-parsing | raw }default url-extraction

default

Configures the default setting of after-parsing.
after-parsing

Specifies sending the parsed URI and host name. Percent-encoded hex characters in URLs sent from the ACF client to the ICAP server will be converted to corresponding ASCII characters before being sent.

For example, the URL: http://www.google.co.uk/?this%20is%20a%20test will be sent to the ICAP server as:

http://www.google.co.uk/?this is a test
raw

Specifies sending raw URI and host name. The URLs will contain percent-encoded hex characters “as is”.

For example, the URL http://www.google.co.uk/?this%20is%20a%20test will be sent to the ICAP server as:

http://www.google.co.uk/?this%20is%20a%20test
Usage:

Use this command to configure the ICAP URL extraction behavior. Percent-encoded hex characters—for example, space (%20) and the percent character (%25)—in URLs sent from the ACF client to the ICAP server can be sent either as percent-encoded hex characters or as their corresponding ASCII characters.
Example:
The following command configures URLs sent from the ACF client to the ICAP server to contain the escape encoding as is:

    url-extraction raw