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Protecting Your Network
4-1
Chapter 4
Protecting Your Network
This chapter describes how to use the basic firewall features of the DG824M Wireless ADSL
Modem Gateway to protect your network.
Protecting Access to Your DG824M Wireless ADSL Modem
Gateway
For security reasons, the gateway 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 gateway User Name and
password
for the gateway Password. You
can use procedures below to change the gateway'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.
Procedure 4-1:
Changing the Built-In Password
1.
Log in to the gateway at its default LAN address of http://192.168.0.1 with its default User
Name of
admin
, default password of
password
, or using whatever Password and LAN
address you have chosen for the gateway.
Figure 4-1: Log in to the gateway
Page 52 / 154
Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
4-2
Protecting Your Network
2.
From the Main Menu of the browser interface, under the Maintenance heading, select Set
Password to bring up the menu shown in
Figure 4-2
.
Figure 4-2: 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 gateway settings previously, you should do a new
backup so that the saved settings file includes the new password.
Procedure 4-1:
Changing the Administrator Login Timeout
For security, the administrator's login to the
gateway
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.
Page 53 / 154
Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
Protecting Your Network
4-3
Configuring Basic Firewall Services
Basic firewall services you can configure include access blocking and scheduling of firewall
security. These topics are presented below.
Blocking Keywords, Sites, and Services
The
gateway provides a variety of options for blocking Internet based content and
communications services.
With its content filtering feature, the DG824M gateway prevents
objectionable content from reaching your PCs. The Model RT311 router allows you to control
access to Internet content by screening for keywords within Web addresses. Key content filtering
options include:
•
Blocks access from your LAN to Internet locations that you specify as off-limits.
•
Keyword blocking of newsgroup names.
•
Outbound Services 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.
•
Blocks unwanted traffic from the Internet to your LAN.
The section below explains how to configure your
gateway to perform these functions.
Procedure 4-2:
Block Keywords and Sites
The DG824M gateway allows you to restrict access to Internet content based on functions such as
Java or Cookies, Web addresses and Web address keywords.
1.
Log in to the gateway at its default LAN address of http://192.168.0.1 with its default User
Name of
admin
, default password of
password
, or using whatever Password and LAN
address you have chosen for the gateway.
Page 54 / 154
Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
4-4
Protecting Your Network
2.
Click on the Block Sites link of the Security menu.
Figure 4-3: Block Sites menu
3.
To enable keyword blocking, check “Turn keyword blocking on”, 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, as is the newsgroup alt.pictures.xxx.
•
If the keyword “.com” is specified, only websites 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.
4.
To delete a keyword or domain, select it from the list, click Delete Keyword, then click Apply.
5.
To specify a Trusted User, enter that PC’s IP address in the Trusted User box and click Apply.
You may specify one Trusted User, which is a PC that will be exempt from blocking and
logging. Since the Trusted User will be identified by an IP address, you should configure that
PC with a fixed IP address.
Page 55 / 154
Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
Protecting Your Network
4-5
6.
Click Apply to save your settings.
Rules
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.
A firewall has two default rules, one for inbound traffic and one for outbound. The default rules of
the DG824M 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 may 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.

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