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156 Chapter 10 Firewalls
Figure 45 Business Secure Router firewall application
Denial of Service
Denial 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
device or network so users no longer have access to network resources. The
Business Secure Router is preconfigured to automatically detect and thwart
currently known DoS attacks.
Basics
Computers share information over the Internet using a common language called
TCP/IP. TCP/IP, in turn, is a set of application protocols that perform specific
functions. An extension number, called the TCP port or UDP port, identifies these
protocols, such as HTTP (Web), FTP (File Transfer Protocol), and POP3
(E-mail). For example, Web traffic uses TCP port 80, by default.
NN47923-500
Business Secure Router
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Troubleshooting
