Netgear UTM25-100NAS ユーザーズマニュアル
5-1
v1.0, September 2009
Chapter 5
Firewall Protection
This chapter describes how to use the firewall features of the UTM to protect your network. This
chapter contains the following sections:
chapter contains the following sections:
•
” on this page.
•
•
.
•
.
•
•
.
•
.
•
.
About Firewall Protection
A firewall 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. To set up LAN Groups, see
untrusted network, such as the Internet), while allowing communication between the two. You can
further segment keyword blocking to certain known groups. To set up LAN Groups, see
.
A firewall incorporates the functions of a Network Address Translation (NAT) router, protects the
trusted network from hacker intrusions or attacks, and controls 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.
trusted network from hacker intrusions or attacks, and controls 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.