Nortel BSR252 Configuration - Basics page 168

168 Chapter 10 Firewalls
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distinguish traffic originating from an inside host or an outside host by IP
address.
The firewall performs better than filtering if you need to check many rules.
Use the firewall if you need routine e-mail reports about your system or need
to be alerted when attacks occur.
The firewall can block any specific URL traffic that occurs in the future. The
URL can be saved in an Access Control List (ACL) database.