Transparent Squid Proxy using WCCP

[cooperwaldon]

Hello,

I am trying to configure a transparent proxy using WCCPv2 and Squid proxy in our network infrastructure.  I'm trying to figure out how to transparently capture traffic from our three office routers and forward the traffic to the Squid proxy servers, where we have one in each datacenter.

We have layer 2 adjacency between the two DC and everything is routable between all the devices.

The issue that I'm having is that all the documentation I can find seems to suggest that the only way to get multiple routers to communicate with the squid cache is to use multicast but we currently do not allow multicast routing.  I'm not sure if this is possible?  

Can I configure each squid server to server multiple routers simply using unicast or is multicast a requirement?

I have attached a very basic network diagram to give an idea of the configuration that I'm looking at.  If anyone has any suggestions that would be much appreciated.

Thank you.

[Philip D'Ath]

What kind of routers are you using?

[cooperwaldon]

The Internet Gateways are ASR1001, the Office Routers are a 3925, and two 2821.

[Philip D'Ath]

You should be able to do something like:

ip wccp web-cache
interface Gigabit a/b
  ip wccp web-cache redirect in

And then tell the squid proxy to register themselves with the routers,  You only need to use multicast if you want the router and cache to find themselves automatically.