I have install a Sophos UTM with home license. Now I want to configure web filtering via our ISP. They have a proxy address on port 8080. Now I configure in Web Filtering the parent proxy. But when this is active, internet is very slow. Using of CPU and memory is not very high. When I directly configure this proxy settings on client, it is not slow.
My conclusion is that the delay is much higher when the web protection module check the external proxy. Now I want to try to configure forwarding all HTTP traffic to the external proxy on port 8080.
I read some topics about NAT and SNAT, but I didn't understand how I can configure a NAT-rule for forwarding all HTTP traffic to the external proxy.
Is there anybody that can me tell if it is possible to forward HTTP traffic by using NAT how I configure this rule?
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