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Page 41 / 157 Scroll up to view Page 36 - 40
3-1
v1.0, March 2010
Chapter 3
Protecting Your Network
This chapter describes how to use the basic firewall features of the ADSL2+ Modem Wireless
Router to protect your network.
Protecting Access to Your ADSL2+ Modem Wireless Router
For security reasons, the modem router has its own user name and password. Also, after a period
of inactivity for a set length of time, the administrator login automatically disconnects. When
prompted, enter
adminC
for the modem router user name and
password
for the modem router
password. You can use procedures in the following sections to change the modem router password
and the amount of time for the administrator’s login time-out.
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.
Changing the Built-In Password
1.
Log in to the modem 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 modem router.
Note:
The user name and password are not the same as a user name or password you
might use to log in to your Internet connection.
Figure 3-1
Page 42 / 157
Wireless ADSL2+ Modem Router DG834Gv5 User Manual
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Protecting Your Network
v1.0, March 2010
2.
From the main menu, under the Maintenance heading, select Set Password to display the Set
Password screen:
3.
To change the password, first enter the old password, and then enter the new password twice.
4.
Click
Apply
to save your changes.
Changing the Administrator Login Time-out
For security, the administrator login to the modem router configuration times out after a period of
inactivity. To change the login time-out period:
1.
In the Set Password screen, type a number in the
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 in the following sections.
Figure 3-2
Note:
After changing the password, you must log in again to continue the
configuration. If you have backed up the modem router settings previously,
you should do a new backup so that the saved settings file includes the new
password.
Page 43 / 157
Wireless ADSL2+ Modem Router DG834Gv5 User Manual
Protecting Your Network
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v1.0, March 2010
Blocking Keywords, Sites, and Services
The modem router provides a variety of options for blocking Internet-based content and
communications services. With its content filtering feature, the modem router prevents
objectionable content from reaching your PCs. You can control access to Internet content by
screening for keywords within Web addresses. 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. 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 following section explains how to configure your
modem router to perform these
functions.
Blocking Keywords and Sites
The
modem router
allows you to restrict access to Internet content based on Web addresses and
Web address keywords.
1.
Log in to the modem router at its default LAN address of
with its default
user name of
admin
, and default password of
password
, or using whatever password and
LAN address you have chosen for the modem router.
Page 44 / 157
Wireless ADSL2+ Modem Router DG834Gv5 User Manual
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Protecting Your Network
v1.0, March 2010
2.
On the main menu, select Block Sites to display the Block Sites screen:
3.
To enable keyword blocking, select one of the following:
•
Per Schedule
. Turn on keyword blocking according to the settings on the Schedule
screen.
•
Always
. Turn on keyword blocking all the time, independent of the setting in the Schedule
screen.
4.
Enter a keyword or domain in the
Keyword
field, click
Add Keyword
, and then click
Apply
.
Some examples of keyword applications are shown in the following chart.
Up to 32 entries are supported in the Keyword list.
Figure 3-3
Keyword
Result
XXX
.com
Only websites with other domain suffixes (such as .edu or .gov) can be
viewed.
. ( a period)
Block all Internet browsing access.
Page 45 / 157
Wireless ADSL2+ Modem Router DG834Gv5 User Manual
Protecting Your Network
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5.
To delete a keyword or domain, select it from the list, click
Delete Keyword
, and then click
Apply
.
6.
To specify a trusted user, enter that computer’s IP address in the
Trusted IP Address
field,
and then 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.
7.
Click
Apply
to save your settings.
Firewall Rules
Firewall rules block or allow specific traffic passing through from one side of the modem 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.
The default inbound and outbound rules of the
modem router
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”
for more details.
To view or change firewall rules, select Firewall Rules on the main menu.
Note:
If you block sites, you can set up the modem router to log attempts to access
them. See
“Viewing, Selecting, and Saving Logged Information” on page 4-8
.

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