ZyXEL p-662h-61 Guia Do Utilizador

Prestige 662HW Series User’s Guide

Chapter 13 Firewalls

156

• The firewall provides e-mail service to notify you of routine reports and when alerts 

occur.

• To prevent DoS attacks and prevent hackers cracking your network.

• A range of source and destination IP addresses as well as port numbers can be specified 

within one firewall rule making the firewall a better choice when complex rules are 
required.

• To selectively block/allow inbound or outbound traffic between inside host/networks and 

outside host/networks. Remember that filters can not 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 specific URL traffic that might occur in the future. The URL can 

be saved in an Access Control List (ACL) database.