Transparent interception and multicast mode

To configure Content Gateway to run in multicast mode, you must enable multicast mode and specify the multicast IP address in the Content Gateway manager.


	Important GRE packet Forward/Return method cannot be used with multicast mode.

In addition, you must set the multicast address on your routers for each service group being intercepted (HTTP, FTP, DNS, and SOCKS). The following procedure provides an example of how to set the multicast address for different service groups on a WCCP v2-enabled router.

Telnet to the router and switch to Enable mode.

At the prompt, enter the following command to configure the router from the terminal:

configure terminal

At the prompt, enter the following command for each service group that the router intercepts:

<hostname>(config)# ip wccp <service_group> group-address

<multicast_address>

Here, <hostname> is the hostname of the router you are configuring, <service_group> is the service group ID (for example, 0 for HTTP), and <multicast_address> is the IP multicast address.

At the prompt, enter the following command to configure the network interface:

interface <interface_name>

Here, <interface_name> is the network interface on the router that is being intercepted and redirected.

At the prompt, enter the following command for each service group that the router intercepts:

<hostname>(config-if)# ip wccp <service_group> group-listen

Exit and save the router configuration.