Testing Your Setup
Now that we have set our focus on testing, it's time to dust off the precise specification that describes how your setup should work. We put it aside for a few chapters in order to show you the features we thought you would like to know about, but now it's pretty essential that you have your specification ready for referencing. Realistically, for anything past a truly trivial setup, it is fairly essential to have a specification in hand.
The specification we have been working through in this book runs roughly like this, with minor variations:
The physical layout of our sample network is centered on a gateway that is connected to the Internet via $ext_if. Attached to the gateway via $int_if is a local network with workstations ...
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