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Page 51 / 104 Scroll up to view Page 46 - 50
TL-WR840N
300Mbps Wireless N Router User Guide
- 42 -
4.7.3 Address Reservation
Choose menu “
DHCP
→
Address Reservation
”, you can view and add a reserved address for
clients via the next screen (shown in Figure 4-28).When you specify a reserved IP address for a
PC on the LAN, that PC will always receive the same IP address each time when it accesses the
DHCP server. Reserved IP addresses should be assigned to the servers that require permanent
IP settings.
Figure 4-28
Address Reservation
MAC Address -
The MAC address of the PC for which you want to reserve an IP address.
Reserved IP Address -
The IP address reserved for the PC by the Router.
Status
-
The status of this entry, either
Enabled
or
Disabled
.
To Reserve an IP address:
1.
Click the
Add New…
button. Then Figure 4-29 will pop up.
2.
Enter the MAC address (in XX-XX-XX-XX-XX-XX format.) and IP address (in dotted-decimal
notation) of the computer for which you want to reserve an IP address.
3.
Click the
Save
button.
Figure 4-29
Add or Modify an Address Reservation Entry
To modify or delete an existing entry:
1.
Click the
Modify
in the entry you want to modify. If you want to delete the entry, click the
Delete
.
2.
Modify the information.
3.
Click the
Save
button.
Click the
Enable/Disable All
button to make all entries enabled/disabled
Click the
Delete All
button to delete all entries.
Click the
Next
button to go to the next page and Click the
Previous
button to return the previous
page.
Page 52 / 104
TL-WR840N
300Mbps Wireless N Router User Guide
- 43 -
4.8 Forwarding
Figure 4-30 The Forwarding menu
There are four submenus under the Forwarding menu (shown in Figure 4-30),
Virtual Servers
,
Port Triggering
,
DMZ
and
UPnP
. Click any of them, and you will be able to configure the
corresponding function.
4.8.1 Virtual Servers
Choose menu “
Forwarding
→
Virtual Servers
”, you can view and add virtual servers in the
screen as shown in Figure 4-31. Virtual servers can be used for setting up public services on
your LAN, such as DNS, Email and FTP. A virtual server is defined as a service port, and all
requests from the Internet to this service port will be redirected to the computer specified by the
server IP. Any PC that was used for a virtual server must have a static or reserved IP Address
because its IP Address may be changed when using the DHCP function.
Figure 4-31
Virtual Servers
Service Port -
The numbers of External Ports. You can type a service port or a range of
service ports (in XXX – YYY format, XXX is the start port number, YYY is the end port
number).
Internal Port
- The Internal Service Port number of the PC running the service application.
You can leave it blank if the
Internal Port
is the same as the
Service Port
, or enter a
specific port number when
Service Port
is a single one.
IP Address -
The IP Address of the PC providing the service application.
Protocol -
The protocol used for this application, either
TCP
,
UDP
, or
All
(all protocols
supported by the Router).
Status -
The status of this entry, either
Enabled
or
Disabled
.
To set up a virtual server entry:
Page 53 / 104
TL-WR840N
300Mbps Wireless N Router User Guide
- 44 -
1.
Click the
Add New…
button, the next screen will pop-up as shown in Figure 4-32.
2.
Select the service port you want to use from the
Common Service Port
list. If the
Common
Service Port
list does not have the service that you want to use, type the service port
number or service port range in the
Service Port
box.
3.
Type the IP Address of the computer in the
IP Address
box.
4.
Select the protocol used for this application, either
TCP
,
UDP
, or
All
.
5.
Select the
Enable
to enable the virtual server.
6.
Click the
Save
button.
Figure 4-32
Add or Modify a Virtual Server Entry
Note:
If your computer or server has more than one type of available service, please select another
service, and enter the same IP Address for that computer or server.
To modify or delete an existing entry:
1.
Click the
Modify
in the entry you want to modify. If you want to delete the entry, click the
Delete
.
2.
Modify the information.
3.
Click the
Save
button.
Click the
Enable/Disable All
button to make all entries enabled/disabled.
Click the
Delete All
button to delete all entries.
Click the
Next
button to go to the next page and click the
Previous
button to return the previous
page.
Note:
If you set the service port of the virtual server as 80, you must set the Web management port on
“
Security
→
Remote Management
” page to be any other value except 80 such as 8080.
Otherwise there will be a conflict to disable the virtual server.
4.8.2 Port Triggering
Choose menu “
Forwarding
→
Port Triggering
”, you can view and add port triggering in the screen
as shown in Figure 4-33. Some applications require multiple connections, like Internet games, video
Page 54 / 104
TL-WR840N
300Mbps Wireless N Router User Guide
- 45 -
conferencing, Internet calling and so on. These applications cannot work with a pure NAT Router.
Port Triggering is used for some of these applications that can work with an NAT Router.
Figure 4-33
Port Triggering
Once the Router is configured, the operation is as follows:
1. A local host makes an outgoing connection using a destination port number defined in the
Trigger Port field.
2. The Router records this connection, opens the incoming port or ports associated with this
entry in the Port Triggering table, and associates them with the local host.
3. When necessary
，
the external host will be able to connect to the local host using one of the
ports defined in the
Incoming Ports
field.
Trigger Port -
The port for outgoing traffic. An outgoing connection using this port will trigger
this rule.
Trigger Protocol -
The protocol used for Trigger Ports, either
TCP
,
UDP
, or
All
(all
protocols supported by the Router).
Incoming Ports -
The port or port range used by the remote system when it responds to the
outgoing request. A response using one of these ports will be forwarded to the PC that
triggered this rule. You can input at most 5 groups of ports (or port sections). Every group of
ports must be set apart with ",". For example, 2000-2038, 2050-2051, 2085, 3010-3030.
Incoming Protocol -
The protocol used for Incoming Ports Range, either
TCP
or
UDP
, or
ALL
(all protocols supported by the Router).
Status -
The status of this entry, either
Enabled
or
Disabled
.
To add a new rule, follow the steps below.
1.
Click the
Add New…
button, the next screen will pop-up as shown in Figure 4-34.
2.
Select a common application from the
Common Applications
drop-down list, then the
Trigger Port
field and the
Incoming Ports
field will be automatically filled. If the
Common
Applications
do not have the application you need, enter the
Trigger Port
and the
Incoming Ports
manually.
3.
Select the protocol used for Trigger Port from the
Trigger Protocol
drop-down list, either
TCP
,
UDP
, or
All
.
4.
Select the protocol used for Incoming Ports from the
Incoming Protocol
drop-down list,
either
TCP
or
UDP
, or
All.
Page 55 / 104
TL-WR840N
300Mbps Wireless N Router User Guide
- 46 -
5.
Select
Enable
in
Status
field.
6.
Click the
Save
button to save the new rule.
Figure 4-34
Add or Modify a Port Triggering Entry
To modify or delete an existing entry:
1.
Click the
Modify
in the entry you want to modify. If you want to delete the entry, click the
Delete
.
2.
Modify the information.
3.
Click the
Save
button.
Click the
Enable All
button to make all entries enabled
Click the
Disable All
button to make all entries disabled.
Click the
Delete All
button to delete all entries
Note:
1.
When the trigger connection is released, the corresponding opening ports will be closed.
2.
Each rule is allowed to be used only by one host on LAN synchronously. The trigger
connection of other hosts on LAN will be refused.
3.
Incoming Ports cannot overlap each other.
4.8.3 DMZ
Choose menu “
Forwarding
→
DMZ
”, you can view and configure DMZ host in the screen as
shown in Figure 4-35. The DMZ host feature allows one local host to be exposed to the Internet
for a special-purpose service such as Internet gaming or videoconferencing. DMZ host forwards
all the ports at the same time. Any PC whose port is being forwarded must have its DHCP client
function disabled and should have a new static IP Address assigned to it because its IP Address
may be changed when using the DHCP function.

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