Other WCCP service group options
In addition to using WCCP service groups to define the types of traffic to be cached by WCCP the following options are available for servers and clients.
Server configuration options
The server configuration must include the router-id, which is the WCCP server IP address. This is the IP address of the interface that the server uses to communicate with WCCP clients.
The group-address is used for multicast WCCP configurations to specify the multicast addresses of the clients.
The server-list defines the IP addresses of the WCCP clients that the server can connect to. Often the server list can be the address of the subnet that contains the WCCP clients.
The authentication option enables or disables authentication for the WCCP service group. Authentication must be enabled on all servers and clients in a service group and members of the group must have the same password.
The forward-method option specifies the protocol used for communication between the server and clients. The default forwarding method is GRE encapsulation. If required by your network you can also select to use unencapsulated layer-2 packets instead of GRE or select any to allow both. The return-method allows you to specify the communication method from the client to the server. Both GRE and layer-2 are supported.
The assignment-method determines how the server load balances sessions to the clients if there are multiple clients. Load balancing can be done using hashing or masking.
Client configuration options
The client configuration includes the cache-id which is the IP address of the FortiGate interface of the client that communicates with WCCP server. The router-list option is the list of IP addresses of the WCCP servers in the WCCP service group.
The ports option lists the port numbers of the sessions to be cached by the client and the protocol sets the protocol number of the sessions to be cached. For TCP sessions the protocol is 6.
The service-type option can be auto, dynamic or standard. Usually you would not change this setting.
The client configuration also includes options to influence load balancing including the primary-hash, priority, assignment-weight and assignment-bucket-format.
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