Chapter 11 Firewall Configuration
P-660HWP-D1 User’s Guide
163
3
Is it possible to modify the rule to be more specific? For example, if IRC is blocked for
all users, will a rule that blocks just certain users be more effective?
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
Drop
,
Reject
or
Permit
?
"
“Drop” means the firewall silently discards the packet. “Reject” means the
firewall discards packets and sends an ICMP destination-unreachable message
to the sender.
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 or 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 or 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 and WAN to WAN/ Router rules apply to packets coming in on the
associated interface (LAN or WAN respectively). LAN to LAN/ Router means policies for
LAN-to-P-660HWP-D1 (the policies for managing the P-660HWP-D1 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
port.
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Страница 7: ...Safety Warnings P 660HWP D1 User s Guide 7...
Страница 8: ...Safety Warnings P 660HWP D1 User s Guide 8...
Страница 10: ...Contents Overview P 660HWP D1 User s Guide 10...
Страница 20: ...Table of Contents P 660HWP D1 User s Guide 20...
Страница 26: ...List of Figures P 660HWP D1 User s Guide 26...
Страница 31: ...31 PART I Introduction Introducing the P 660HWP D1 33 Introducing the Web Configurator 41...
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Страница 39: ...Chapter 1 Introducing the P 660HWP D1 P 660HWP D1 User s Guide 39 Figure 7 P 660HWP D1 with ISDN...
Страница 40: ...Chapter 1 Introducing the P 660HWP D1 P 660HWP D1 User s Guide 40...
Страница 54: ...Chapter 2 Introducing the Web Configurator P 660HWP D1 User s Guide 54 Figure 19 System General...
Страница 55: ...55 PART II Wizards Wizard Setup for Internet Wireless Access 57 Bandwidth Management Wizard 69...
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Страница 90: ...Chapter 5 WAN Setup P 660HWP D1 User s Guide 90...
Страница 147: ...147 PART IV Security Firewalls 149 Firewall Configuration 161 Content Filtering 183 Certificates 187...
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Страница 168: ...Chapter 11 Firewall Configuration P 660HWP D1 User s Guide 168 Figure 93 Firewall Edit Rule...
Страница 182: ...Chapter 11 Firewall Configuration P 660HWP D1 User s Guide 182...
Страница 186: ...Chapter 12 Content Filtering P 660HWP D1 User s Guide 186...
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Страница 214: ...Chapter 14 Static Route P 660HWP D1 User s Guide 214...
Страница 230: ...Chapter 16 Dynamic DNS Setup P 660HWP D1 User s Guide 230...
Страница 242: ...Chapter 17 Remote Management Configuration P 660HWP D1 User s Guide 242...
Страница 254: ...Chapter 18 Universal Plug and Play UPnP P 660HWP D1 User s Guide 254...
Страница 255: ...255 PART VI Maintenance and Troubleshooting System 257 Logs 263 Tools 281 Diagnostic 287 Troubleshooting 289...
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Страница 262: ...Chapter 19 System P 660HWP D1 User s Guide 262...
Страница 280: ...Chapter 20 Logs P 660HWP D1 User s Guide 280...
Страница 286: ...Chapter 21 Tools P 660HWP D1 User s Guide 286...
Страница 296: ...296...
Страница 340: ...Appendix D IP Subnetting P 660HWP D1 User s Guide 340...
Страница 344: ...Appendix E Command Interpreter P 660HWP D1 User s Guide 344...
Страница 360: ...Appendix H Legal Information P 660HWP D1 User s Guide 360...
Страница 366: ...Appendix I Customer Support P 660HWP D1 User s Guide 366...
Страница 374: ...Index P 660HWP D1 User s Guide 374...