Netgear FVS338 참조 매뉴얼

Firewall Protection and Content Filtering

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This chapter describes how to use the content filtering features of the FVS338 ProSafe VPN 
Firewall 50 to protect your network. These features can be found by clicking on the Content 
Filtering heading in the Main Menu of the browser interface. 

The FVS338 ProSafe VPN Firewall 50 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. 

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. 
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.