ZyXEL P-661HNU-F3 User Guide - Page 203
Firewall Technical Reference, 13.4.1 Guidelines For Enhancing Security With Your Firewall
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Chapter 13 Firewall Table 49 Security > Firewall > Services (continued) LABEL DESCRIPTION Delete Select a service in the Blocked Services, and click this to remove the service from the list. Clear All Click this to remove all the services in the Blocked Services list. Apply Click Apply to save your changes. Cancel Click Cancel to restore your previously saved settings. 13.4 Firewall Technical Reference This section provides some technical background information about the topics covered in this chapter. 13.4.1 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 ZyXEL Device. 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 Keep the firewall in a secured (locked) room. 13.4.2 Security Considerations Note: Incorrectly configuring the firewall may block valid access or introduce security risks to the ZyXEL 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: 1 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? P-661HNU-Fx User's Guide 203