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Page 56 / 104 Scroll up to view Page 51 - 55
TL-WR840N
300Mbps Wireless N Router User Guide
- 47 -
Figure 4-35
DMZ
To assign a computer or server to be a DMZ server:
1.
Check the
Enable
radio button.
2.
Enter the IP Address of a local host in the
DMZ Host IP Address
field.
3.
Click the
Save
button.
Note:
After you set the DMZ host, the firewall related to the host will not work.
4.8.4 UPnP
Choose menu “
Forwarding
→
UPnP
”, you can view the information about
UPnP
(Universal Plug
and Play) in the screen as shown in Figure 4-36. The UPnP feature allows the devices, such as
Internet computers, to access the local host resources or devices as needed. UPnP devices can
be automatically discovered by the UPnP service application on the LAN.
Figure 4-36 UPnP
Current UPnP Status -
UPnP can be enabled or disabled by clicking the
Enable
or
Disable
button.
Current UPnP Settings List -
This table displays the current UPnP information.
•
App Description -
The description provided by the application in the UPnP request.
•
External Port
-
The external port the Router opens for the application.
•
Protocol -
The type of protocol the Router opens for the application.
•
Internal Port
-
The Internal port the Router opens for local host.
•
IP Address
-
The IP address of the UPnP device that is currently accessing the Router.
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TL-WR840N
300Mbps Wireless N Router User Guide
- 48 -
•
Status -
The status of the port is displayed here. “Enabled” means that the port is still
active. Otherwise, the port is inactive.
Click
Refresh
to update the Current UPnP Settings List.
4.9 Security
Figure 4-37 The Security menu
There are four submenus under the Security menu as shown in Figure 4-37:
Basic Security
,
Advanced Security
,
Local Management
and
Remote Management.
Click any of them, and you
will be able to configure the corresponding function.
4.9.1 Basic Security
Choose menu “
Security
→
Basic Security
”, you can configure the basic security in the screen
as shown in Figure 4-38.
Figure 4-38 Basic Security
Firewall -
A firewall protects your network from the outside world. Here you can enable or
disable the Router’s firewall.
SPI Firewall -
SPI (Stateful Packet Inspection, also known as dynamic packet filtering)
helps to prevent cyber attacks by tracking more state per session. It validates that the
traffic passing through the session conforms to the protocol. SPI Firewall is enabled by
Page 58 / 104
TL-WR840N
300Mbps Wireless N Router User Guide
- 49 -
factory default. If you want all the computers on the LAN exposed to the outside world,
you can disable it.
VPN -
VPN Passthrough must be enabled if you want to allow VPN tunnels using IPSec,
PPTP, or L2TP protocols to pass through the Router’s firewall.
PPTP Passthrough -
Point-to-Point Tunneling Protocol (PPTP) allows the Point-to-Point
Protocol (PPP) to be tunneled through an IP network. To allow PPTP tunnels to pass
through the Router, keep the default,
Enabled
.
L2TP Passthrough
-
Layer 2 Tunneling Protocol (L2TP) is the method used to enable
Point-to-Point sessions via the Internet on the Layer 2 level. To allow L2TP tunnels to
pass through the Router, keep the default,
Enabled
.
IPSec Passthrough
-
Internet Protocol Security (IPSec) is a suite of protocols for
ensuring private, secure communications over Internet Protocol (IP) networks, through
the use of cryptographic security services. To allow IPSec tunnels to pass through the
Router, keep the default,
Enabled
.
ALG -
It is recommended to enable Application Layer Gateway (ALG) because ALG allows
customized Network Address Translation (NAT) traversal filters to be plugged into the
gateway to support address and port translation for certain application layer "control/data"
protocols such as FTP, TFTP, H323 etc.
FTP ALG -
To allow FTP clients and servers to transfer data across NAT, keep the
default
Enable
.
TFTP ALG -
To allow TFTP clients and servers to transfer data across NAT, keep the
default
Enable
.
H323 ALG -
To allow Microsoft NetMeeting clients to communicate across NAT, keep
the default
Enable
.
RTSP ALG
- To allow some media player clients to communicate with some streaming
media servers across NAT, click Enable.
Click the
Save
button to save your settings.
4.9.2 Advanced Security
Choose menu “
Security
→
Advanced Security
”, you can protect the Router from being
attacked by TCP-SYN Flood, UDP Flood and ICMP-Flood in the screen as shown in Figure 4-39.
Page 59 / 104
TL-WR840N
300Mbps Wireless N Router User Guide
- 50 -
Figure 4-39
Advanced Security
Packets Statistics Interval (5~60) -
The default value is 10. Select a value between 5 and
60 seconds from the drop-down list. The Packets Statistics Interval value indicates the time
section of the packets statistics. The result of the statistics is used for analysis by SYN Flood,
UDP Flood and ICMP-Flood.
DoS Protection -
Denial of Service protection. Check the Enable or Disable button to
enable or disable the DoS protection function. Only when it is enabled, will the flood filters be
enabled.
Note:
Dos Protection will take effect only when the
Traffic Statistics
in “
System Tools
→
Statistics
” is enabled.
Enable ICMP-FLOOD Attack Filtering
-
Enable or Disable the ICMP-FLOOD Attack
Filtering.
ICMP-FLOOD Packets Threshold (5~3600)
-
The default value is 50. Enter a value
between 5
~
3600. When the current ICMP-FLOOD Packets number is beyond the set value,
the Router will startup the blocking function immediately.
Enable UDP-FLOOD Filtering
-
Enable or Disable the UDP-FLOOD Filtering.
UDP-FLOOD Packets Threshold (5~3600)
-
The default value is 500. Enter a value
between 5
~
3600. When the current UPD-FLOOD Packets number is beyond the set value,
the Router will startup the blocking function immediately.
Enable TCP-SYN-FLOOD Attack Filtering
-
Enable or Disable the TCP-SYN-FLOOD
Attack Filtering.
Page 60 / 104
TL-WR840N
300Mbps Wireless N Router User Guide
- 51 -
TCP-SYN-FLOOD Packets Threshold (5~3600)
-
The default value is 50. Enter a value
between 5
~
3600. When the current TCP-SYN-FLOOD Packets numbers is beyond the set
value, the Router will startup the blocking function immediately.
Ignore Ping Packet From WAN Port to Router
-
Enable or Disable Ignore Ping Packet
From WAN Port to Router. The default setting is disabled. If enabled, the ping packet from
the Internet cannot access the Router.
Forbid Ping Packet From LAN Port to Router
-
Enable or Disable Forbid Ping Packet From
LAN Port to Router. The default setting is disabled. If enabled, the ping packet from LAN
cannot access the Router. This function can be used to defend against some viruses.
Click the
Save
button to save the settings.
Click the
Blocked DoS Host List
button to display the DoS host table by blocking.
4.9.3 Local Management
Choose menu “
Security
→
Local Management
”, you can configure the management rule in the
screen as shown in Figure 4-40. The management feature allows you to deny computers in LAN
from accessing the Router.
Figure 4-40 Local Management
By default, the radio button “
All the PCs on the LAN are allowed to access the Router's
Web-Based Utility
” is checked. If you want to allow PCs with specific MAC Addresses to access
the Setup page of the Router's Web-Based Utility locally from inside the network, check the radio
button “
Only the PCs listed can browse the built-in web pages to perform Administrator
tasks
”, and then enter each MAC Address in a separate field. The format for the MAC Address is
XX-XX-XX-XX-XX-XX (X is any hexadecimal digit). Only the PCs with MAC address listed can
use the password to browse the built-in web pages to perform Administrator tasks while all the
others will be blocked.
After click the
Add
button, your PC's MAC Address will be placed in the list above.

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