Prestige 652H/HW Series User’s Guide
Firewalls
12-3
Figure 12-1 Prestige Firewall Application
12.4 Denial of Service
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 device or network so users no longer have access to network
resources. The Prestige is pre-configured to automatically detect and thwart all known DoS attacks.
12.4.1 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), POP3 (E-mail),
etc. For example, Web traffic by default uses TCP port 80.
When computers communicate on the Internet, they are using the client/server model, where the server
"listens" on a specific TCP/UDP port for information requests from remote client computers on the network.
For example, a Web server typically listens on port 80. Please note that while a computer may be intended
for use over a single port, such as Web on port 80, other ports are also active. If the person configuring or
managing the computer is not careful, a hacker could attack it over an unprotected port.
Some of the most common IP ports are:
Table 12-1 Common IP Ports
Summary of Contents for Prestige 652H series
Page 32: ......
Page 50: ......
Page 66: ......
Page 68: ......
Page 76: ......
Page 80: ......
Page 120: ...Prestige 652H HW Series User s Guide 8 12 WAN Setup Figure 8 6 Advanced WAN Backup ...
Page 128: ......
Page 146: ......
Page 148: ......
Page 162: ......
Page 178: ...Prestige 652H HW Series User s Guide 13 16 Firewall Screens Figure 13 8 Rule Edit Example ...
Page 196: ......
Page 198: ......
Page 204: ......
Page 214: ...Prestige 652H HW Series User s Guide 16 10 VPN Screens Figure 16 5 VPN IKE ...
Page 227: ...Prestige 652H HW Series User s Guide VPN Screens 16 23 Figure 16 8 Manual Setup ...
Page 238: ......
Page 258: ......
Page 277: ...Maintenance VIII Part VIII Maintenance This part covers the maintenance screens ...
Page 278: ......
Page 296: ......
Page 298: ......
Page 308: ......
Page 324: ......
Page 330: ......
Page 386: ......
Page 406: ......
Page 418: ......
Page 428: ......
Page 450: ......
Page 454: ......
Page 464: ......
Page 470: ......
Page 486: ......
Page 494: ......
Page 500: ......
Page 512: ......
Page 516: ......
Page 520: ......
Page 560: ......
Page 574: ......