The web cash control protocol WCCP feature can be used on a firewall, internet router or core switch to enable external appliances as Cisco cache engine or web/url filtering engine as websense handle web traffic.
When a Web Cache Control Protocol-enabled router receives an IP packet, the router determines if the packet is a request that should be directed to an external appliance. The router looks for TCP as the protocol field in the IP header and for 80 as the destination port in the TCP header. If the packet meets these criteria, it is redirected to an external appliance.
Configuring WCCP
wccp configuration example:
! enable wccp globally
ip wccp 0
! if you want to specify intresting traffic; a access-list can be used
ip wccp 0 redirect-list WCCP-ACL
! to use a password
ip wccp 0 password wccp-password
! wccp should be configured on a interface
interface vlan 10
description internet facing interface
ip wccp 0 redirect out
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