P-662H/HW-D Series User’s Guide
Chapter 10 Firewalls
179
10.6.1 Security In General
You can never be too careful! Factors outside your firewall, filtering or NAT can cause
security breaches. Below are some generalizations about what you can do to minimize them.
• Encourage your company or organization to develop a comprehensive security plan.
Good network administration takes into account what hackers can do and prepares
against attacks. The best defense against hackers and crackers is information. Educate all
employees about the importance of security and how to minimize risk. Produce lists like
this one!
• DSL or cable modem connections are “always-on” connections and are particularly
vulnerable because they provide more opportunities for hackers to crack your system.
Turn your computer off when not in use.
• Never give out a password or any sensitive information to an unsolicited telephone call or
e-mail.
• Never e-mail sensitive information such as passwords, credit card information, etc.,
without encrypting the information first.
• Never submit sensitive information via a web page unless the web site uses secure
connections. You can identify a secure connection by looking for a small “key” icon on
the bottom of your browser (Internet Explorer 3.02 or better or Netscape 3.0 or better). If
a web site uses a secure connection, it is safe to submit information. Secure web
transactions are quite difficult to crack.
• Never reveal your IP address or other system networking information to people outside
your company. Be careful of files e-mailed to you from strangers. One common way of
getting BackOrifice on a system is to include it as a Trojan horse with other files.
• Change your passwords regularly. Also, use passwords that are not easy to figure out.
The most difficult passwords to crack are those with upper and lower case letters,
numbers and a symbol such as % or #.
• Upgrade your software regularly. Many older versions of software, especially web
browsers, have well known security deficiencies. When you upgrade to the latest
versions, you get the latest patches and fixes.
• If you use “chat rooms” or IRC sessions, be careful with any information you reveal to
strangers.
• If your system starts exhibiting odd behavior, contact your ISP. Some hackers will set off
hacks that cause your system to slowly become unstable or unusable.
• Always shred confidential information, particularly about your computer, before
throwing it away. Some hackers dig through the trash of companies or individuals for
information that might help them in an attack.
10.7 Packet Filtering Vs Firewall
Below are some comparisons between the ZyXEL Device’s filtering and firewall functions.
Содержание 802.11g ADSL 2+ 4-Port Security Gateway HW-D Series
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Страница 10: ...P 662H HW D Series User s Guide 10 Customer Support ...
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Страница 32: ...P 662H HW D Series User s Guide 32 List of Figures ...
Страница 38: ...P 662H HW D Series User s Guide 38 List of Tables ...
Страница 64: ...P 662H HW D Series User s Guide 64 Chapter 2 Introducing the Web Configurator ...
Страница 84: ...P 662H HW D Series User s Guide 84 Chapter 4 Bandwidth Management Wizard ...
Страница 108: ...P 662H HW D Series User s Guide 108 Chapter 5 WAN Setup ...
Страница 122: ...P 662H HW D Series User s Guide 122 Chapter 6 LAN Setup ...
Страница 155: ...P 662H HW D Series User s Guide Chapter 8 DMZ 155 Figure 81 DMZ Private and Public Address Example ...
Страница 156: ...P 662H HW D Series User s Guide 156 Chapter 8 DMZ ...
Страница 188: ...P 662H HW D Series User s Guide 188 Chapter 11 Firewall Configuration Figure 97 Firewall Edit Rule ...
Страница 202: ...P 662H HW D Series User s Guide 202 Chapter 11 Firewall Configuration ...
Страница 210: ...P 662H HW D Series User s Guide 210 Chapter 12 Anti Virus Packet Scan ...
Страница 214: ...P 662H HW D Series User s Guide 214 Chapter 13 Content Filtering ...
Страница 232: ...P 662H HW D Series User s Guide 232 Chapter 14 Content Access Control ...
Страница 238: ...P 662H HW D Series User s Guide 238 Chapter 15 Introduction to IPSec ...
Страница 273: ...P 662H HW D Series User s Guide Chapter 17 Certificates 273 Figure 144 My Certificate Details ...
Страница 284: ...P 662H HW D Series User s Guide 284 Chapter 17 Certificates Figure 152 Trusted Remote Host Details ...
Страница 292: ...P 662H HW D Series User s Guide 292 Chapter 18 Static Route ...
Страница 303: ...P 662H HW D Series User s Guide Chapter 19 Bandwidth Management 303 Figure 162 Bandwidth Management Monitor ...
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Страница 308: ...P 662H HW D Series User s Guide 308 Chapter 20 Dynamic DNS Setup ...
Страница 332: ...P 662H HW D Series User s Guide 332 Chapter 22 Universal Plug and Play UPnP ...
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Страница 344: ...P 662H HW D Series User s Guide 344 Chapter 24 Logs ...
Страница 350: ...P 662H HW D Series User s Guide 350 Chapter 25 Tools ...
Страница 363: ...P 662H HW D Series User s Guide Chapter 27 Troubleshooting 363 Figure 213 Security Setting ActiveX Controls ...
Страница 364: ...P 662H HW D Series User s Guide 364 Chapter 27 Troubleshooting ...
Страница 368: ...P 662H HW D Series User s Guide 368 Product Specifications ...
Страница 372: ...P 662H HW D Series User s Guide 372 Appendix C Wall mounting Instructions ...
Страница 408: ...P 662H HW D Series User s Guide 408 Appendix F Wireless LANs ...
Страница 420: ...P 662H HW D Series User s Guide 420 Appendix H Command Interpreter ...
Страница 436: ...P 662H HW D Series User s Guide 436 Appendix L NetBIOS Filter Commands ...
Страница 462: ...P 662H HW D Series User s Guide 462 Appendix M Internal SPTGEN ...
Страница 484: ...P 662H HW D Series User s Guide 484 Appendix P Triangle Route ...