I am planing put PAN Device on vwire mode just before traffic reach their Proxy solution. Traffic redirect using WCCP web traffic from Cisoc switch to Cisco Ironport.The Proxy device only has one NIC interface.In this secenario What we will see? Only WCCP traffic, or Web traffic, from Switch to Proxy, and Web responses from Proxy to Switch, where only Proxy IP is showed as source IP or can wee see all the user traffic.
I haven't worked with WCCP myself, but we do have app-ids for web-browsing, http-proxy and wccp. So one recommendation you can do is to start with allowing these applications through and then check your traffic logs. That should tell you what applications in particular you should be concerned with and then apply your rules accordingly.
Hope this helps.
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