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Protecting Your Network
5-1
202-10006-05, June 2005
Chapter 5
Protecting Your Network
This chapter describes how to use the basic firewall features of the DG834G Wireless ADSL
Firewall Router to protect your network.
Protecting Access to Your DG834G Wireless ADSL Firewall
Router
For security reasons, the router has its own user name and password. Also, after a period of
inactivity for a set length of time, the administrator login will automatically disconnect. When
prompted, enter
admin
for the router User Name and
password
for the router Password. You can
use procedures below to change the router's password and the amount of time for the
administrator’s login timeout.
Note:
The user name and password are not the same as any user name or password your may use
to log in to your Internet connection.
NETGEAR recommends that you change this password to a more secure password. The ideal
password should contain no dictionary words from any language, and should be a mixture of both
upper and lower case letters, numbers, and symbols.
Your password can be up to 30 characters.
How to Change the Built-In Password
1.
Log in to the router at its default LAN address of
with its default User Name
of
admin
, default password of
password
, or using whatever Password and LAN address you
have chosen for the router.
Figure 5-1:
Log in to the router
2.
From the Main Menu of the browser interface, under the Maintenance heading, select Set
Password to bring up the menu shown in
Figure 5-2
.
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Reference Manual for the Model Wireless ADSL Firewall Router DG834G
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Protecting Your Network
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Figure 5-2:
Set Password menu
3.
To change the password, first enter the old password, and then enter the new password twice.
4.
Click Apply to save your changes.
Note:
After changing the password, you will be required to log in again to continue the
configuration. If you have backed up the router settings previously, you should do a new backup so
that the saved settings file includes the new password.
Changing the Administrator Login Timeout
For security, the administrator's login to the router configuration will timeout after a period of
inactivity. To change the login timeout period:
1.
In the Set Password menu, type a number in ‘Administrator login times out’ field. The
suggested default value is 5 minutes.
2.
Click Apply to save your changes or click Cancel to keep the current period.
Configuring Basic Firewall Services
Basic firewall services you can configure include access blocking and scheduling of firewall
security. These topics are presented below.
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Reference Manual for the Model Wireless ADSL Firewall Router DG834G
Protecting Your Network
5-3
202-10006-05, June 2005
Blocking Keywords, Sites, and Services
The router provides a variety of options for blocking Internet based content and communications
services. With its content filtering feature, the DG834G wireless router prevents objectionable
content from reaching your PCs. The router allows you to control access to Internet content by
screening for keywords within Web addresses. Key content filtering options include:
•
Keyword blocking of HTTP traffic.
•
Outbound Service Blocking limits access from your LAN to Internet locations or services that
you specify as off-limits.
•
Denial of Service (DoS) protection. Automatically detects and thwarts Denial of Service
(DoS) attacks such as Ping of Death, SYN Flood, LAND Attack and IP Spoofing.
•
Blocking unwanted traffic from the Internet to your LAN.
The section below explains how to configure your
router to perform these functions.
How to Block Keywords and Sites
The DG834G wireless router allows you to restrict access to Internet content based on functions
such as Web addresses and Web address keywords.
1.
Log in to the router at its default LAN address of
with its default User Name
of
admin
, default password of
password
, or using whatever Password and LAN address you
have chosen for the router.
2.
Select the Block Sites link of the Security menu.
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Reference Manual for the Model Wireless ADSL Firewall Router DG834G
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Protecting Your Network
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Figure 5-3:
Block Sites menu
3.
To enable keyword blocking, select one of the following:
•
Per Schedule—to turn on keyword blocking according to the settings on the Schedule
page.
•
Always—to turn on keyword blocking all of the time, independent of the Schedule page.
4.
Enter a keyword or domain in the Keyword box, click Add Keyword, then click Apply.
Some examples of Keyword application follow:
•
If the keyword “XXX” is specified, the URL <http://www.badstuff.com/xxx.html> is
blocked.
•
If the keyword “.com” is specified, only Web sites with other domain suffixes (such as
.edu or .gov) can be viewed.
•
Enter the keyword “.” to block all Internet browsing access.
Up to 32 entries are supported in the Keyword list.
5.
To delete a keyword or domain, select it from the list, click Delete Keyword, then click Apply.
6.
To specify a trusted user, enter that computer’s IP address in the Trusted IP Address box and
click Apply.
You can specify one trusted user, which is a computer that will be exempt from blocking and
logging. Since the trusted user will be identified by an IP address, you should configure that
computer with a fixed IP address.
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Reference Manual for the Model Wireless ADSL Firewall Router DG834G
Protecting Your Network
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7.
Click Apply to save your settings.
Firewall Rules
Firewall rules are used to block or allow specific traffic passing through from one side of the router
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.
A firewall has two default rules, one for inbound traffic and one for outbound. The default rules of
the DG834G are:
•
Inbound: Block all access from outside except responses to requests from the LAN side.
•
Outbound: Allow all access from the LAN side to the outside.
You can define additional rules that will specify exceptions to the default rules. By adding custom
rules, you can block or allow access based on the service or application, source or destination IP
addresses, and time of day. You can also choose to log traffic that matches or does not match the
rule you have defined.
You can change the order of precedence of rules so that the rule that applies most often will take
effect first. See
“Order of Precedence for Rules” on page 5-11
for more details.
To access the rules configuration of the DG834G, click the Firewall Rules link on the main menu,
then click Add for either an Outbound or Inbound Service.
Figure 5-4:
Rules menu

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