If the Squid proxy is using some filtering too, include it in this list to make sure that block pages are displayed properly.
You can, as last resort, explicitly exclude the proxies by IP address, host, and FQDN to make sure that they’re covered. The above statements might cover the conditions in which local traffic is excluded from being proxied. When it isn’t, unpredictable results might happen due to proxy loop conditions occurring. Because Web Gateway has many techniques to manipulate traffic for security and authentication, it’s imperative that any session directed to Web Gateway, under any port number, is excluded. This exclusion is the most important part of a PAC file when used with Web Gateway.
Excluding Web Gateway itself from being proxied. So, if you sometimes want Web Gateway to resolve short names, you can edit file /etc/nf and change the search entry. You can have DNS search suffixes appended to a host name in Web Gateway. This function is the same as selecting Bypass proxy server for local addresses in the browser. There is a third proxy, Squid proxy, used only by the Wireless network. There are some Guest Wireless networks with the IP addresses 192.168.0.0/16. There are two Web Gateways, one at each location:. The LAN IP addresses are split between two physical locations and subnets:. The domain is contained within a DMZ that is accessible from the internet. But, when an internal user resolves that domain, the private DMZ addresses are returned, not the public addresses (common in a split-DNS environment). Any host within this domain is resolved to an internal private IP address. The local DNS domain of the network is company.local. Suppose that you have the following network: You might need to specify the exceptions differently depending on browser because not all browsers interpret the PAC file in the same manner. You can define these exceptions in the PAC file the browser uses. For example, don’t proxy the administration session to the Web Gateway user interface because it might intercept and filter important information out of the session. (For example, caching, content scanning, authentication, and SSL decryption.) This single session reduces network traffic.īecause Web Gateway uses techniques like page redirection, session injection, and JavaScript insertion, it’s important that traffic to Web Gateway is not proxied. Web Gateway performs many security functions using a single session from the client to the server. It’s common practice to not proxy connections that are destined for an internal web server in your private network. A request would be made to a proxy server, which would service that request and respond with the page. 
Web proxies were originally used as a simple gateway mechanism to cache the flow of traffic to the internet.
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