P-660H/HW/W-T Series User’ Guide
Chapter 11 Firewall Configuration
134
4
Does a rule that allows Internet users access to resources on the LAN create a security
vulnerability? For example, if FTP ports (TCP 20, 21) are allowed from the Internet to the
LAN, Internet users may be able to connect to computers with running FTP servers.
5
Does this rule conflict with any existing rules?
6
Once these questions have been answered, adding rules is simply a matter of plugging the
information into the correct fields in the web configurator screens.
11.3.3 Key Fields For Configuring Rules
11.3.3.1 Action
Should the action be to
Block
or
Forward
? “Block” means the firewall silently discards the
packet.
11.3.3.2 Service
Select the service from the
Service
scrolling list box. If the service is not listed, it is necessary
to first define it. See
for more information on predefined services.
11.3.3.3 Source Address
What is the connection’s source address; is it on the LAN, WAN? Is it a single IP, a range of
IPs or a subnet?
11.3.3.4 Destination Address
What is the connection’s destination address; is it on the LAN, WAN? Is it a single IP, a range
of IPs or a subnet?
11.4 Connection Direction
This section describes examples for firewall rules for connections going from LAN to WAN
and from WAN to LAN.
LAN to LAN/ Router, WAN to WAN/ Router rules apply to packets coming in on the
associated interface (LAN, WAN respectively). LAN to LAN/ Router means policies for
LAN-to-Prestige (the policies for managing the Prestige through the LAN interface) and
policies for LAN-to-LAN (the policies that control routing between two subnets on the LAN).
Similarly, WAN to WAN/ Router polices apply in the same way to the WAN ports.
11.4.1 LAN to WAN Rules
The default rule for LAN to WAN traffic is that all users on the LAN are allowed non-
restricted access to the WAN. When you configure a LAN to WAN rule, you in essence want
to limit some or all users from accessing certain services on the WAN. WAN to LAN Rules
Summary of Contents for P-660H - VERSION 3.40
Page 1: ...P 660H HW W T Series ADSL 2 Gateway User s Guide Version 3 40 6 2005...
Page 9: ...P 660H HW W T Series User Guide 9 Customer Support...
Page 31: ...P 660H HW W T Series User Guide 31 List of Figures...
Page 37: ...P 660H HW W T Series User Guide 37 List of Tables...
Page 41: ...P 660H HW W T Series User Guide 41 Introduction to DSL...
Page 61: ...P 660H HW W T Series User Guide 61 Chapter 3 Wizard Setup for Internet Access...
Page 89: ...P 660H HW W T Series User Guide 89 Chapter 5 Wireless LAN...
Page 131: ...P 660H HW W T Series User Guide 131 Chapter 10 Firewalls...
Page 161: ...P 660H HW W T Series User Guide 161 Chapter 13 Remote Management Configuration...
Page 175: ...P 660H HW W T Series User Guide 175 Chapter 14 Universal Plug and Play UPnP...
Page 181: ...P 660H HW W T Series User Guide 181 Chapter 15 Logs Screens...
Page 195: ...P 660H HW W T Series User Guide 195 Chapter 16 Media Bandwidth Management Advanced Setup...
Page 207: ...P 660H HW W T Series User Guide 207 Chapter 17 Maintenance...
Page 217: ...P 660H HW W T Series User Guide 217 Chapter 19 Menu 1 General Setup...
Page 221: ...P 660H HW W T Series User Guide 221 Chapter 20 Menu 2 WAN Backup Setup...
Page 225: ...P 660H HW W T Series User Guide 225 Chapter 21 Menu 3 LAN Setup...
Page 229: ...P 660H HW W T Series User Guide 229 Chapter 22 Wireless LAN Setup...
Page 235: ...P 660H HW W T Series User Guide 235 Chapter 23 Internet Access...
Page 249: ...P 660H HW W T Series User Guide 249 Chapter 25 Static Route Setup...
Page 253: ...P 660H HW W T Series User Guide 253 Chapter 26 Bridging Setup...
Page 269: ...P 660H HW W T Series User Guide 269 Chapter 27 Network Address Translation NAT...
Page 285: ...P 660H HW W T Series User Guide 285 Chapter 29 Filter Configuration...
Page 305: ...P 660H HW W T Series User Guide 305 Chapter 32 System Information and Diagnosis...
Page 317: ...P 660H HW W T Series User Guide 317 Chapter 33 Firmware and Configuration File Maintenance...
Page 323: ...P 660H HW W T Series User Guide 323 Chapter 34 System Maintenance...
Page 327: ...P 660H HW W T Series User Guide 327 Chapter 35 Remote Management...
Page 337: ...P 660H HW W T Series User Guide 337 Chapter 36 IP Policy Routing...
Page 341: ...P 660H HW W T Series User Guide 341 Chapter 37 Call Scheduling...
Page 357: ...P 660H HW W T Series User Guide 357 Appendix A...
Page 359: ...P 660H HW W T Series User Guide 359 Appendix B...
Page 383: ...P 660H HW W T Series User Guide 383 Appendix D...
Page 387: ...P 660H HW W T Series User Guide 387 Appendix F...
Page 393: ...P 660H HW W T Series User Guide 393 Appendix G...
Page 397: ...P 660H HW W T Series User Guide 397 Appendix H...
Page 400: ...P 660H HW W T Series User Guide Appendix I 400...
Page 401: ...P 660H HW W T Series User Guide 401 Appendix I...
Page 455: ...P 660H HW W T Series User Guide 455 Appendix M...
