Prestige 662H/HW Series User’s Guide
2What direction of traffic does the rule apply to (refer to the Firewall Policies Overview section)?
3What IP services will be affected?
4What computers on the LAN or DMZ are to be affected (if any)?
5What computers on the Internet will be affected? The more specific, the better. For example, if traffic is being allowed from the Internet to the LAN, it is better to allow only certain machines on the Internet to access the LAN.
14.3.2Security Ramifications1Once the logic of the rule has been defined, it is critical to consider the security ramifications created by the rule:
2Does this rule stop LAN users from accessing critical resources on the Internet? For example, if IRC is blocked, are there users that require this service?
3Is 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?
4Does 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.
5Does this rule conflict with any existing rules?
6Once these questions have been answered, adding rules is simply a matter of plugging the information into the correct fields in the web configurator screens.
14.3.3Key Fields For Configuring Rules14.3.3.1 Action
Should the action be to Block or Forward?
Note: “Block” means the firewall silently discards the packet.
14.3.3.2 Service
Select the service from the Service scrolling list box. If the service is not listed, it is necessary to first define it. See the Predefined Services section for more information on predefined services.
14.3.3.3 Source Address
What is the connection’s source address; is it on the LAN, DMZ, WAN? Is it a single IP, a range of IPs or a subnet?
Chapter 14 Firewall Configuration | 160 |