Netgear FVX538NA 사용자 설명서

Firewall Protection and Content Filtering

4-1

This chapter describes how to use the content filtering features of the ProSafe VPN Firewall 200 to 
protect your network. These features can be found by selecting Security from the main menu and 
selecting Block Sites from the submenu of the browser interface. 

The ProSafe VPN Firewall 200 provides you with Web content filtering options, plus browsing 
activity reporting and instant alerts via e-mail. Parents and network administrators can establish 
restricted access policies based on time-of-day, Web addresses and Web address keywords. You 
can also block Internet access by applications and services, such as chat or games.

A firewall is a special category of router that protects one network (the “trusted” network, such as 
your LAN) from another (the untrusted network, such as the Internet), while allowing 
communication between the two. You can further segment keyword blocking to certain known 
groups (see 

 to set up LAN Groups).

A firewall incorporates the functions of a NAT (Network Address Translation) router, while 
adding features for dealing with a hacker intrusion or attack, and for controlling the types of traffic 
that can flow between the two networks. Unlike simple Internet sharing NAT routers, a firewall 
uses a process called stateful packet inspection to protect your network from attacks and 
intrusions. NAT performs a very limited stateful inspection in that it considers whether the 
incoming packet is in response to an outgoing request, but true Stateful Packet Inspection goes far 
beyond NAT.

Firewall rules are used to block or allow specific traffic passing through from one side to the other. 
You can configure up to 600 rules on the FVX538. Inbound rules (WAN to LAN) restrict access by 
outsiders to private resources, selectively allowing only specific outside users to access specific 
resources. Outbound rules (LAN to WAN) determine what outside resources local users can have 
access to.