All models are wrong, some are useful.
Layer 4 to 7 is useful in this case, as layer 4 involves forging tcp/udp packets, which is vastly different than say a http level reverse proxy.
Layer 4 to 7 is useful in this case, as layer 4 involves forging tcp/udp packets, which is vastly different than say a http level reverse proxy.
There's a separate term for the bits of the OSI model that are actually relevant; it's called the IETF model.