P-662H/HW-D Series User’s Guide
Chapter 12 Anti-Virus Packet Scan
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H A P T E R
12
Anti-Virus Packet Scan
This chapter introduces and shows you how to configure the anti-virus packet scan.
12.1 Overview
A computer virus is a small program designed to corrupt and/or alter the operation of other
legitimate programs. A worm is a self-replicating virus that resides in active memory and
duplicates itself. The effect of a virus attack varies from doing so little damage that you are
unaware your computer is infected to wiping out the entire contents of a hard drive to
rendering your computer inoperable.
12.1.1 Types of Computer Viruses
The following table describes some of the common computer viruses.
12.2 Signature-Based Virus Scan
The “signature-based” approach is the most common way to detect the presence of viruses.
Signature-based anti-virus scanning consists of two key components: a pattern file that
contains the signatures for known viruses and a scanning engine.
Signatures are byte patterns that are unique to a particular virus. These signatures are stored in
a pattern file. The scanning engine compares the files with the signatures in the pattern file.
Table 72
Common Computer Virus Types
TYPE
DESCRIPTION
File Infector
This is a small program that embeds itself in a legitimate program. A file infector is
able to copy and attach itself to other programs that are executed on an infected
computer.
Boot Sector Virus
This type of virus infects the area of a hard drive that a computer reads and
executes during startup. The virus causes computer crashes and to some extend
renders the infected computer inoperable.
Macro Virus
Macros are small programs that are created to perform repetitive actions. Macros
run automatically when a file to which they are attached is opened. Macro viruses
spread more rapidly than other types of viruses as data files are often shared on a
network.
E-mail Virus
E-mail viruses are malicious programs that spread through e-mail. These can
infect your computer even if you do not read the e-mail messages.
Summary of Contents for 802.11g ADSL 2+ 4-Port Security Gateway HW-D Series
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Page 10: ...P 662H HW D Series User s Guide 10 Customer Support ...
Page 24: ...P 662H HW D Series User s Guide 24 Table of Contents ...
Page 32: ...P 662H HW D Series User s Guide 32 List of Figures ...
Page 38: ...P 662H HW D Series User s Guide 38 List of Tables ...
Page 64: ...P 662H HW D Series User s Guide 64 Chapter 2 Introducing the Web Configurator ...
Page 84: ...P 662H HW D Series User s Guide 84 Chapter 4 Bandwidth Management Wizard ...
Page 108: ...P 662H HW D Series User s Guide 108 Chapter 5 WAN Setup ...
Page 122: ...P 662H HW D Series User s Guide 122 Chapter 6 LAN Setup ...
Page 156: ...P 662H HW D Series User s Guide 156 Chapter 8 DMZ ...
Page 202: ...P 662H HW D Series User s Guide 202 Chapter 11 Firewall Configuration ...
Page 210: ...P 662H HW D Series User s Guide 210 Chapter 12 Anti Virus Packet Scan ...
Page 214: ...P 662H HW D Series User s Guide 214 Chapter 13 Content Filtering ...
Page 232: ...P 662H HW D Series User s Guide 232 Chapter 14 Content Access Control ...
Page 238: ...P 662H HW D Series User s Guide 238 Chapter 15 Introduction to IPSec ...
Page 273: ...P 662H HW D Series User s Guide Chapter 17 Certificates 273 Figure 144 My Certificate Details ...
Page 292: ...P 662H HW D Series User s Guide 292 Chapter 18 Static Route ...
Page 304: ...P 662H HW D Series User s Guide 304 Chapter 19 Bandwidth Management ...
Page 308: ...P 662H HW D Series User s Guide 308 Chapter 20 Dynamic DNS Setup ...
Page 332: ...P 662H HW D Series User s Guide 332 Chapter 22 Universal Plug and Play UPnP ...
Page 338: ...P 662H HW D Series User s Guide 338 Chapter 23 System ...
Page 344: ...P 662H HW D Series User s Guide 344 Chapter 24 Logs ...
Page 350: ...P 662H HW D Series User s Guide 350 Chapter 25 Tools ...
Page 364: ...P 662H HW D Series User s Guide 364 Chapter 27 Troubleshooting ...
Page 368: ...P 662H HW D Series User s Guide 368 Product Specifications ...
Page 372: ...P 662H HW D Series User s Guide 372 Appendix C Wall mounting Instructions ...
Page 408: ...P 662H HW D Series User s Guide 408 Appendix F Wireless LANs ...
Page 420: ...P 662H HW D Series User s Guide 420 Appendix H Command Interpreter ...
Page 436: ...P 662H HW D Series User s Guide 436 Appendix L NetBIOS Filter Commands ...
Page 462: ...P 662H HW D Series User s Guide 462 Appendix M Internal SPTGEN ...
Page 484: ...P 662H HW D Series User s Guide 484 Appendix P Triangle Route ...