Chapter 14 Firewall
VMG1312-T10C User’s Guide
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• WAN to Router
By default the Device stops computers on the WAN from managing the Device. You could
configure one of these rules to allow a WAN computer to manage the Device.
Note: You also need to configure the remote management settings to allow a WAN
computer to manage the Device.
You may define additional rules and sets or modify existing ones but please exercise extreme
caution in doing so.
For example, you may create rules to:
• Block certain types of traffic, such as IRC (Internet Relay Chat), from the LAN to the Internet.
• Allow certain types of traffic, such as Lotus Notes database synchronization, from specific hosts
on the Internet to specific hosts on the LAN.
• Allow everyone except your competitors to access a web server.
• Restrict use of certain protocols, such as Telnet, to authorized users on the LAN.
These custom rules work by comparing the source IP address, destination IP address and IP
protocol type of network traffic to rules set by the administrator. Your customized rules take
precedence and override the Device’s default rules.
14.6.2 Guidelines For Enhancing Security With Your Firewall
1
Change the default password via web configurator.
2
Think about access control before you connect to the network in any way.
3
Limit who can access your router.
4
Don't enable any local service (such as telnet or FTP) that you don't use. Any enabled service could
present a potential security risk. A determined hacker might be able to find creative ways to misuse
the enabled services to access the firewall or the network.
5
For local services that are enabled, protect against misuse. Protect by configuring the services to
communicate only with specific peers, and protect by configuring rules to block packets for the
services at specific interfaces.
6
Protect against IP spoofing by making sure the firewall is active.
7
Keep the firewall in a secured (locked) room.
14.6.3 Security Considerations
Note: Incorrectly configuring the firewall may block valid access or introduce security
risks to the Device and your protected network. Use caution when creating or
deleting firewall rules and test your rules after you configure them.
Consider these security ramifications before creating a rule:
Summary of Contents for VMG1312-T10C
Page 4: ...Contents Overview VMG1312 T10C User s Guide 4 ...
Page 12: ...Table of Contents VMG1312 T10C User s Guide 12 ...
Page 13: ...13 PART I User s Guide ...
Page 14: ...14 ...
Page 20: ...Chapter 1 Introduction VMG1312 T10C User s Guide 20 ...
Page 28: ...28 ...
Page 34: ...Chapter 4 Connection Status and System Info VMG1312 T10C User s Guide 34 ...
Page 106: ...Chapter 7 Home Networking VMG1312 T10C User s Guide 112 ...
Page 144: ...Chapter 13 Filter VMG1312 T10C User s Guide 152 ...
Page 164: ...Chapter 15 Parental Control VMG1312 T10C User s Guide 172 ...
Page 172: ...Chapter 16 Certificates VMG1312 T10C User s Guide 180 ...
Page 178: ...Chapter 17 System Monitor VMG1312 T10C User s Guide 186 ...
Page 180: ...Chapter 18 User Account VMG1312 T10C User s Guide 188 ...
Page 184: ...Chapter 20 System VMG1312 T10C User s Guide 192 ...
Page 190: ...Chapter 22 Log Setting VMG1312 T10C User s Guide 198 ...
Page 196: ...Chapter 24 Backup Restore VMG1312 T10C User s Guide 204 ...
Page 214: ...Chapter 26 Diagnostic VMG1312 T10C User s Guide 222 ...
Page 232: ...Appendix B Legal Information VMG1312 T10C User s Guide 240 ...