Netgear FVS338 FVS338 Reference Manual - Page 55

Firewall Protection and Content Filtering, About Firewall Security - bandwidth limit

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Chapter 4 Firewall Protection and Content Filtering The ProSafe VPN Firewall 50 provides you with Web content filtering options such as Block Sites and Keyword Blocking. This chapter includes the following sections: • "About Firewall Security" on page 4-1 • "Adding Customized Services" on page 4-17 • "Specifying Quality of Service (QoS) Priorities" on page 4-19 • "Setting a Schedule to Block or Allow Specific Traffic" on page 4-20 • "Setting Block Sites (Content Filtering)" on page 4-20 • "Enabling Source MAC Filtering" on page 4-23 • "Setting Up Port Triggering" on page 4-26 • "Bandwidth Limiting" on page 4-28 • "E-Mail Notifications of Event Logs and Alerts" on page 4-30 • "Administrator Information" on page 4-34 About Firewall Security 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 Protection and Content Filtering 4-1 v1.0, March 2009

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Firewall Protection and Content Filtering
4-1
v1.0, March 2009
Chapter 4
Firewall Protection and Content Filtering
The ProSafe VPN Firewall 50 provides you with Web content filtering options such as Block Sites
and Keyword Blocking. This chapter includes the following sections:
•
“About Firewall Security” on page 4-1
•
“Adding Customized Services” on page 4-17
•
“Specifying Quality of Service (QoS) Priorities” on page 4-19
•
“Setting a Schedule to Block or Allow Specific Traffic” on page 4-20
•
“Setting Block Sites (Content Filtering)” on page 4-20
•
“Enabling Source MAC Filtering” on page 4-23
•
“Setting Up Port Triggering” on page 4-26
•
“Bandwidth Limiting” on page 4-28
•
“E-Mail Notifications of Event Logs and Alerts” on page 4-30
•
“Administrator Information” on page 4-34
About Firewall Security
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.