44 CHAPTER 1: WEB CACHING CONCEPTS AND DEPLOYMENTWCCP V2 supports multiple WCCP-enabled Cisco routers operating withmultiple Webcaches in a service group. Any of the available routers in theservice group can redirect Web requests to any of the availableWebcaches, improving performance and redundancy within yournetwork.For further information, see “Configuring WCCP V2” on page 113.Adding a New Webcache to a Service GroupThere are two ways of adding a new Webcache to an existing WCCPservice group. In the Web interface of each Webcache, you can choose tospecify the IP address for each router or enter a single multicast IPaddress.Specifying a multicast IP address allows you to quickly add a newWebcache to the service group without having to reconfigure everyrouter and Webcache in that group. The existing Webcaches and routerswill automatically configure the new Webcache into the WCCP V2environment.Improving the Security of Your NetworkYou can also enable password authentication between the routers andthe Webcaches. If enabled, the Webcache provides a password when itidentifies itself to the router. An incorrect password causes redirection oftraffic to the Webcache to be disabled. This password system prevents anetwork device from receiving Web traffic for malicious purposes andinproves the security of your network.Proxy RelayDeploymentThe following example describes how to deploy the Webcache with theSuperStack 3 Firewall in a Proxy Relay configuration. The network layoutis shown in Figure 10 below.Web requests from client machines are intercepted by the Firewall,rewritten as proxy requests and redirected to the Webcache. Cache hitresponses from the Webcache are again rewritten by the Firewall so theyappear to have come directly from the origin server.For further information, see “Configuring Proxy Relay with theSuperStack 3 Firewall” on page 114.dua1611-5aaa04.book Page 44 Friday, November 29, 2002 8:56 PM
