Avaya Business Secure Router 252 Configuration - Basics Bedienungsanleitung PDF herunterladen (Seite 166)

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166 Chapter 10 Firewalls

NN47923-500

Any protocol that operates in this way must be supported on a case-by-case basis.

You can use the Custom Ports feature in the WebGUI to do this.

Guidelines for enhancing security with your firewall

1 Change the default password through SMT or WebGUI.

2 Think about access control before you connect your device to the network in

any way. Access to the console port can give unauthorized individuals total

control of the firewall, even with access control configured.

3 Limit who can Telnet into your router.

4 Do not enable any local service (such as SNMP or NTP) that you do not use.

Any enabled service can present a potential security risk. A determined

hacker can 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.

Packet filtering vs. firewall

Below are some comparisons between the filtering and firewall functions of the

Business Secure Router.

Packet filtering:

• The router filters packets as they pass through the router interface according

to the filter rules you designed.

• Packet filtering is a powerful tool, yet can be complex to configure and

maintain, especially if you need a chain of rules to filter a service.

• Packet filtering only checks the header portion of an IP packet.

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