13
Firewall
13.1 Overview
This chapter shows you how to enable the
•allows traffic that originates from your LAN computers to go to all other networks.
•blocks traffic that originates on other networks from going to the LAN.
•blocks SYN and port scanner attacks.
By default, the
13.1.1 What You Can Do in the Firewall Screens
Use the Firewall screen (Section 13.2 on page 112) to enable firewall and/or SPI on the
13.1.2 What You Need to Know About Firewall
SYN Attack
A SYN attack floods a targeted system with a series of SYN packets. Each packet causes the targeted system to issue a
DoS
Denials of Service (DoS) attacks are aimed at devices and networks with a connection to the Internet. Their goal is not to steal information, but to disable a
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