To configure (enable or disable) AV scanning based on the source IP address of a request you must use CPL as shown in the following example:
<cache>
client.address=x.x.x.x response.icap_service(yes)
where x.x.x.x is the source IP address and icap_service is the name of the ICAP service configured on the ProxyAV appliance.
Note: The above CPL enables scanning for the specified source IP addresses. Replace "yes" with "no" to disable AV scanning for the specified IP addresses.