Zyxel-communications 662HW Series Uživatelský manuál stáhnout pdf (Strana 160)

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Prestige 662H/HW Series User’s Guide

Chapter 14 Firewall Configuration 160

2 What direction of traffic does the rule apply to (refer to the Firewall Policies Overview

section)?

3 What IP services will be affected?

4 What computers on the LAN or DMZ are to be affected (if any)?

5 What 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.

14.3.2 Security Ramifications

1 Once the logic of the rule has been defined, it is critical to consider the security

ramifications created by the rule:

2 Does 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?

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.

14.3.3 Key Fields For Configuring Rules

14.3.3.1 Action

Should the action be to Block or Forward?

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?

Note: “Block” means the firewall silently discards the packet.

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