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Setting up an internet gateway
As long as we're setting up network services, we may as well go all the way and set 
up a router to act as a 
gateway
 for our network. A gateway within a network is the 
device you go through to route from one network to another. In this context, the 
internet gateway
 will be the device that sits between your local network and the 
device that provides your internet connection (such as a cable modem). The gateway 
in a typical network is usually a commercial router or firewall, which often also 
provides DNS, DHCP, and routing services as well. 

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Chapter 11