!!! Overview
[{$pagename}] is a [proxy] that does __not modify__ the [request] or [response] beyond what is required for [proxy] [authentication] and [identification]. 

[{$pagename}] implies the [Protocol Client] presumes that the [gateway] is a [NAT] in [Network Layer] and it does not have any idea about the inside of the packet, but through this method the [Network Layer] packets could be sent to the [Application Layer] [proxy] for investigation which maybe referred to as a Transparent [Firewall].

[{$pagename}]  may also known as an intercepting [proxy], inline [proxy], or forced [proxy] which intercepts normal communication at the network layer without requiring any special [client] configuration. [Clients] need not be aware of the existence of the [proxy].[1] 

[{$pagename}] is normally located between the [client] and the [Resource], with the [proxy] performing some of the functions of a [gateway] or [router].

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Proxy_server#Transparent_proxy|Wikipedia:Proxy_server#Transparent_proxy|target='_blank'] - based on information obtained 2017-04-23-