ZyXEL P-660HW-T1 v3 User Guide - Page 228
When To Use The Firewall
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Chapter 12 Packet Filter • The firewall performs stateful inspection. It takes into account the state of connections it handles so that, for example, a legitimate incoming packet can be matched with the outbound request for that packet and allowed in. Conversely, an incoming packet masquerading as a response to a non-existent outbound request can be blocked. • The firewall uses session filtering, i.e., smart rules, that enhance the filtering process and control the network session rather than control individual packets in a session. • The firewall provides e-mail service to notify you of routine reports and when alerts occur. When To Use The Firewall 1 To prevent DoS attacks and prevent hackers cracking your network. 2 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. 3 To selectively block/allow inbound or outbound traffic between inside host/ networks and outside host/networks. Remember that filters cannot distinguish traffic originating from an inside host or an outside host by IP address. 4 The firewall performs better than filtering if you need to check many rules. 5 Use the firewall if you need routine e-mail reports about your system or need to be alerted when attacks occur. 6 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. 228 P-660HW-Tx v3 Series User's Guide