WCCP Settings

WCCP can be used to provide web caching with load balancing and fault tolerance. In a WCCP configuration, a WCCP server receives HTTP requests from users’ web browsers and redirects the requests to one or more WCCP clients. The clients either return cached content or request new content from the destination web servers, before caching it and returning it to the server. The server then returns the content to the original requester. If a WCCP configuration includes multiple WCCP clients, the WCCP server balances traffic among the clients and can detect when a client fails and redirects traffic to still operating clients. WCCP is described by the Web Cache Communication Protocol internet draft.

You can purge specific cached content with a CLI command. See Purging specific cached content for details.

FortiProxy units operate as WCCP clients and support WCCPv2. FortiProxy units use UDP port 2048 for WCCP communication, with user traffic encapsulated in GRE-mode or L2-mode.

This section describes the following:

• WCCP service groups, numbers, IDs, and well-known services
• WCCP configuration overview
• Example: Caching HTTP sessions
• WCCP packet flow
• Configure forward and return methods and adding authentication
• WCCP messages
• Troubleshooting WCCP