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DG-BR4000NG User Manual
121
pornography,
cartoon,
stock,
or
anything).
Add
Click ‘Add’ button to add the URL /
keyword to the URL / Keyword filtering
table.
Reset
Click ‘Reset’ to remove the value you
inputted in URL/Keyword field.
Current URL Blocking Table
All existing URL/Keywords in filtering
table will be listed here.
Delete
If
you
want
to
delete
a
specific
URL/Keyword entry, check the ’Delete’
button. (You can select more than one
entry)
Delete All
If you want to delete all URL/Keyword
listed here, please click ‘Delete All’
button.
Reset
You can also click ‘Reset’ button to
unselect all URL/Keywords.
After you finish with all settings, please click ‘Apply’ button and the following
message will be displayed on your web browser:
If you want to reset all settings in this page back to previously-saved value, please
click ‘Cancel’ button
Please click ‘Continue’ to go back to previous setup menu; to continue on other
setup procedures, or click ‘Apply’ to reboot the router so the settings will take effect
(Please wait for about 30 seconds while router is rebooting).
Page 122 / 144
DG-BR4000NG User Manual
122
3-3-3 DoS Attack Prevention
Denial of Service (DoS) is a common attack measure, by transmitting a great
amount of data or request to your Internet IP address and server, the Internet
connection will become very slow, and server may stop responding because it is not
capable of handling too much traffic.
This router has a built-in DoS attack prevention mechanism; when you activate it,
the router will stop the DoS attack for you.
Please follow the instructions mentioned below to set DoS prevention parameters:
Click ‘DoS’menu on the left of web management interface, under the ‘Firewall’ tab
and the following message will be displayed on your web browser.
Page 123 / 144
DG-BR4000NG User Manual
123
Here is the description of every setup item:
Parameter
Description
Ping of Death
Ping of Death is a special packet, and it
will cause certain computers to stop
responding. Check this box and the
router will filter this kind of packet out.
Discard Ping From WAN
Ping is a common and useful tool to
know the connection status of a specified
remote
network
device
but
some
malicious intruder will try to fill your
network bandwidth with a lot of PING
request data packet, to make your
internet connection become very slow,
even unusable. Check this box and the
router will ignore all inbound PING
request, but when you activate this
function, you will not be able to ping
your own router from internet, too.
Port Scan
Some malicious intruder will try to use a
‘port scanner’ to know how many ports
of your Internet IP address are open, and
they can collect a lot of valuable
information by doing so. Check this box
and the router will block all traffics
which are trying to scan your Internet IP
address.
Sync Flood
This is another kind of attack, which
uses a lot of fake connection request to
consume the memory of your server, and
try
to
make
your
server
become
unusable. Check this box and the router
will filter this kind of traffic out.
Advanced Settings
Click this button and you can set
advanced settings of the DoS prevention
method listed above, please see
section
3-3-3-1 ‘DoS – Advanced Settings’
below.
Page 124 / 144
DG-BR4000NG User Manual
124
After you finish with all settings, please click ‘Apply’ button and the following
message will be displayed on your web browser:
If you want to reset all settings in this page back to previously-saved value, please
click ‘Cancel’ button
Please click ‘Continue’ to go back to previous setup menu; to continue on other
setup procedures, or click ‘Apply’ to reboot the router so the settings will take effect
(Please wait for about 30 seconds while router is rebooting).
Page 125 / 144
DG-BR4000NG User Manual
125
w
displayed on your web browser:
ere is the description of every setup item:
3-3-3-1 DoS - Advanced Settings
When you click ‘Advanced’ button in DoS menu, the following message
ill be
H
Parameter
Description
Ping of Death
Set the threshold of, when this DoS
prevention mechanism will be activated.
Please check the box of Ping of Death,
(how many packets per second, minute,
can also input the ‘Burst’
and input the frequency of threshold
or hour), you
value which means when this number of
‘Ping of Death’ packet is received in
very short time, this DoS prevention
mechanism will be activated.
Discard Ping From WAN
Check the box to activate this DoS
prevention mechanism.
Port Scan
Many kinds of port scan methods are
listed here please check one or more
DoS attack methods you want to prevent.
Sync Flood
Like Ping of Death, you can set when the
DoS prevention mechanism will be
activated.

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