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User Guide 2.3
11
CHAPTER 2
Setting Up Your 
SOHO Network
How does a firewall work?
Fundamentally, a firewall is a way of differentiating between, as 
well as protecting, “us” from “them”. On the public side of your 
SOHO firewall is the entire Internet. The Internet has many 
resources that you want to be able to reach, such as the Web, e-
mail, and conferencing. It also presents dangers to the privacy and 
security of your computers. On the private side of your SOHO 
firewall are all the devices you want to protect from these dangers. 
Using rules we will discuss in Chapter 3: “Configuring Services for 
a SOHO” on page 33
, the WatchGuard SOHO evaluates all traffic 
between the public network (Internet) and the private network 
(your computers) and blocks any suspicious activity. In order for 
this to work as described, you must first configure both the public 
and private network to work together and to talk to one another as 
well as the rest of the world.