Cisco 877: WCCP and all that.

[growse]

I'm having a bit of a strange problem getting WCCP to work with Squid on a Cisco 877. I've got the 877 set up with two VLANs, and I want traffic on vlan2 to have web traffic make use of available squid proxys, which are on vlan1.

Vlan2 is 192.168.100.0/24 and Vlan1 is 192.168.0.0/24. Squid proxy is 192.168.0.12, and the router is .1 on both networks. I've been following this guide mainly: http://www.steveglendinning.com/2009/03/17/wccp-with-cisco-877-and-squid/

My problem is that for clients on vlan2, web connections are just timing out. The only thing I can obviously see to be incorrect is that when I do a 'sh ip wccp', I get the following:

Global WCCP information:
    Router information:
        Router Identifier:                   192.168.100.1
        Protocol Version:                    2.0

    Service Identifier: web-cache
        Number of Service Group Clients:     1
        Number of Service Group Routers:     1
        Total Packets s/w Redirected:        834
          Process:                           56
          CEF:                               778
        Service mode:                        Open
        Service Access-list:                 -none-
        Total Packets Dropped Closed:        0
        Redirect Access-list:                -none-
        Total Packets Denied Redirect:       0
        Total Packets Unassigned:            6
        Group Access-list:                   -none-
        Total Messages Denied to Group:      0
        Total Authentication failures:       0
        Total Bypassed Packets Received:     0

Isn't the 'Router information' IP meant to be my public facing IP address? It thinks it's sending packets down the GRE tunnel to the Squid box, but a tcp dump reveals nothing incoming on the GRE tunnel.

Any ideas?