topic Re: WCCP On Cisco Firewall in Network Security

WCCP On Cisco Firewall

munawar.zeeshan — Mon, 11 Mar 2019 20:16:18 GMT

Hi All,

I have configured WCCP from websense (V10K appliance) on Cisco ASA 5520 (8.2.4 code)

My Websense interfaces are on the inside with IP 10.1.0.5 and 10.1.0.6. All the LAN users also come from the Inside interface. The users were using Proxy server (in their browsers) before the implementation of WebSense. Now to allow all the LAN users to send request to Websense interfaces we have to allow www and https from all LAN users towards any. In this case we will need to permit the full subnet like this on the inside.

Access-list ACL_INSIDE permit ip 10.0.0.0 255.0.0.0 any www

Access-list ACL_INSIDE permit ip 10.0.0.0 255.0.0.0 any https

Which we don’t want to.

When I did a packet trace I noticed that the ACL_Inside is evaluated first before the WCCP redirect that’s why permit in ACL_INSIDE is required. Is there any way we can evaluate WCCP redirect before inside ACL ? Packet tracer output is attached herewith.

OR is it the default behavior of firewall and i need to accomodate thorough some ACL tweek.

Re: WCCP On Cisco Firewall

Jennifer Halim — Mon, 04 Apr 2011 09:16:19 GMT

Yes, interface ACL will always be applied first and WCCP will come after once traffic has been permitted through the interface ACL. That is the default behaviour of the firewall as it will not allow WCCP to even happen if traffic is being denied on interface level ACL.

If you don't want access for some users at all towards the Internet, then you can configure deny above the permit ACL that you already have for the specific user IP Address.

Re: WCCP On Cisco Firewall

munawar.zeeshan — Mon, 04 Apr 2011 12:56:52 GMT

Will permitting Intra-interface same security level traffic might help in this case ?

Re: WCCP On Cisco Firewall

Jennifer Halim — Tue, 05 Apr 2011 05:03:58 GMT

No, that command has nothing to do with WCCP.

"same-security-traffic permit intra-interface" is to allow traffic to go in and out the same interface.

However, in your topology, you will need WCCP to transparent send the traffic to Websense.