Manual Netgear FR114W (page 136 of 150) (English)

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ReferenceManualfor the Model FR114P, FR114Wand FM114PCable/DSL ProSafe Firewall Family

B-10 Networks, Routing, and Firewall Basics

IP Configuration by DHCP

When an IP-based local area network is installed, each PC must be configured with an IP address.

If the PCs need to access the Internet, they should also be configured with a gateway address and

one or more DNS server addresses. As an alternative to manual configuration, there is a method by

which each PC on the network can automatically obtain this configuration information. A device

on the network may act as a Dynamic Host Configuration Protocol (DHCP) server. The DHCP

server stores a list or pool of IP addresses, along with other information (such as gateway and DNS

addresses) that it may assign to the other devices on the network. The FR114P Firewall has the

capacity to act as a DHCP server.

The FR114P Firewall also functions as a DHCP client when connecting to the ISP. The firewall

can automatically obtain an IP address, subnet mask, DNS server addresses, and a gateway address

if the ISP provides this information by DHCP.

Internet Security and Firewalls

When your LAN connects to the Internet through a router, an opportunity is created for outsiders

to access or disrupt your network. A NAT router provides some protection because by the very

nature of the Network Address Translation (NAT) process, the network behind the NAT router is

shielded from access by outsiders on the Internet. However, there are methods by which a

determined hacker can possibly obtain information about your network or at the least can disrupt

your Internet access. A greater degree of protection is provided by a firewall router.

What is a Firewall?

A firewall is a device that protects one network from another, while allowing communication

between the two. A firewall incorporates the functions of the NAT router, while adding features

for dealing with a hacker intrusion or attack. Several known types of intrusion or attack can be

recognized when they occur. When an incident is detected, the firewall can log details of the

attempt, and can optionally send email to an administrator notifying them of the incident. Using

information from the log, the administrator can take action with the ISP of the hacker. In some

types of intrusions, the firewall can fend off the hacker by discarding all further packets from the

hacker’s IP address for a period of time.

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Netgear FR114W Manual

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