Netgear DGFV338 사용자 설명서

Security and Firewall Protection

4-1

This chapter describes how to use the Security features of the ProSafe Wireless ADSL Modem 
VPN Firewall Router to protect your network. These features can be found by selecting Security 
from the main menu of the browser interface. 

The ProSafe Wireless ADSL Modem VPN Firewall Router provides Web Content filtering—by 
Domain name (Web sites) and by Keyword Blocking. Browsing activity reporting and instant 
alerts via e-mail provide reports on Content Filtering activities. Parents and network 
administrators can establish restricted access policies based on time-of-day, specific Web 
Components, Web sites 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.