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Page 86 / 162 Scroll up to view Page 81 - 85
Security
86
D6200 WiFi DSL Modem Router
To specify a trusted computer:
1.
In the Trusted IP Address field, enter the IP address.
2.
Click
Apply
.
Firewall Rules
Services are functions performed by server computers at the request of client computers. For
example, web servers serve web pages, time servers serve time and date information, and
game hosts serve data about other players’ moves. When a computer on the Internet sends a
request for service to a server computer, the requested service is identified by a service or
port number. This number appears as the destination port number in the transmitted IP
packets. For example, a packet that is sent with the destination port number 80 is an HTTP
(web server) request.
The service numbers for many common protocols are defined by the Internet Engineering
Task Force (IETF at
) and published in RFC1700, “Assigned Numbers.”
Service numbers for other applications are typically chosen from the range 1024–65535 by
the authors of the application. Although the WiFi DSL modem router already holds a list of
many service port numbers, you are not limited to these choices. You can often determine
port number information by contacting the publisher of the application, by asking user groups
or newsgroups, or by searching.
Note:
This feature is for advanced administrators only! Incorrect
configuration can cause serious problems.
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Security
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D6200 WiFi DSL Modem Router
To create firewall rules:
1.
Select
ADVANCED > Security > Firewall Rules
.
The Firewall Rules screen lists all firewall rule settings. The default rules allow all
outgoing traffic and block all incoming traffic.
2.
Under Outbound Services, click
Add
.
3.
Configure the following settings:
•
Service
. Select the service or application to be covered by this rule.
If the service or application you want does not appear in the list, you have to define it
as described in
Add Custom Services to Allow or Block
on page 89.
•
Action
. Select the action you want for traffic covered by this rule:
-
BLOCK always
. Always block the traffic covered by this rule.
Page 88 / 162
Security
88
D6200 WiFi DSL Modem Router
-
BLOCK by schedule, otherwise Allow
. Allow the traffic covered by this rule,
unless it is blocked according to the schedule specified on the Schedule screen.
See
Schedule for Firewall Rules
on page 90.
-
ALLOW always
. Always allow the traffic covered by this rule.
This selection is the default setting.
-
ALLOW by schedule, otherwise Block
. Block the traffic covered by this rule,
unless it is blocked according to the schedule specified on the Schedule screen.
See
Schedule for Firewall Rules
on page 90.
ALLOW rules are useful only when the traffic is already covered by a BLOCK rule.
You would use these rules when you want to allow a subset of traffic that is blocked by
another rule.
•
LAN Users
.
These settings determine which computers on your network are affected by this rule,
based on their source (LAN) IP address. Select the option you want:
-
Any
. All local IP addresses are covered by this choice.
-
Address range
. You have to provide the Start and End fields when this option is
selected.
-
Single address
. Enter the required address in the Start field.
•
WAN Servers
.
These settings determine which Internet locations are covered by the rule, based on
their destination (WAN) IP address. Select the option you want:
-
Any
. All Internet IP addresses are covered by this choice.
-
Address range
. You have to provide the Start and End fields when this option is
selected.
-
Single address
. Enter the required address in the Start field.
•
Log
.
This setting determines whether traffic covered by this rule is logged. Select the
action you want:
•
Always
. Always log traffic that is covered by this rule, whether it matches or not.
(This feature is useful when you are debugging your rules.)
•
Never
. Never log traffic covered by this rule, whether it matches or not.
•
Click
Apply
.
Your changes take effect.
4.
To allow or block an inbound service and to set up inbound firewall rules for gaming or other
applications, under Inbound Services, click the
here
link.
You are redirected to the Port Forwarding/Port Triggering screen as described in
Port
Forwarding and Port Triggering
on page 114.
Page 89 / 162
Security
89
D6200 WiFi DSL Modem Router
5.
To close or open the instant messaging ports, under Instant Messaging (IM) Ports, select the
appropriate radio button:
•
Close IM Ports
•
Open IM Ports (IM ports are open by default)
6.
Click
Apply
.
Add Custom Services to Allow or Block
You can define your own incoming and outgoing custom services to allow or block. To add a
service for blocking, first determine which port number or range of numbers is used by the
application.
To add a custom service:
1.
Select
ADVANCED > Security > Firewall Rules
.
2.
Click
Add Custom Service
.
The Add Services screen allows you to specify or edit your own custom service definition.
You can then use the custom service when creating firewall rules.
3.
In the Name field, enter a suitable name for this service.
4.
In the Type list, select the correct type for this service (if in doubt, select TCP/UDP):
•
TCP
•
UDP
•
TCP/UDP
5.
Enter the starting and ending port numbers. If the application uses a single port number,
enter that number in both fields.
6.
Click
Apply
.
Your information is saved, and you return to the previous screen.
Page 90 / 162
Security
90
D6200 WiFi DSL Modem Router
Schedule for Firewall Rules
You can specify the days and time that you want to block Internet access.
To specify the firewall rule schedule:
1.
Select
ADVANCED > Security > Schedule
.
2.
Set up the schedule for blocking keywords and services:
•
Days to Block
. Select days on which you want to apply blocking by selecting the
appropriate check boxes, or select
Every Day
to select the check boxes for all days.
•
Time of Day to Block
. Select a start and end time in 24-hour format, or select
All
Day
for 24-hour blocking.
3.
Select your time zone from the list. If you use daylight saving time, select the
Automatically
adjust for daylight savings time
check box.
4.
Click
Apply
.

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