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Chapter 4: Configuration
122
Internal IP Address:
The private IP in the LAN network, which will be providing the virtual server
application.
List all existing PCs connecting to the network. You may assign a PC
with IP address and MAC from this list.
Example:
If you like to remote accessing your Router through the Web/HTTP at all time, you would need to
enable port number 80 (Web/HTTP) and map to Router’s IP Address.
Then all incoming HTTP
requests from you (Remote side) will be forwarded to the Router with IP address of 192.168.1.254.
Since port number 80 has already been predefined, next to the
Application
click
Helper.
A list of
predefined rules window will pop and select
HTTP_Sever
.
Application:
HTTP_Sever
Time Schedule:
Always On
Protocol:
tcp
External Port:
80-80
Redirect Port:
80-80
IP Address:
192.168.1.254
Edit:
Click it to edit this virtual server application.
Delete:
Click it to delete this virtual server application.
If you have disabled the NAT option in the WAN-ISP section, the Virtual Server
function will hence be invalid.
If the DHCP server option is enabled, you have to be very careful in assigning the IP
addresses of the virtual servers in order to avoid conflicts. The easiest way of
configuring Virtual Servers is to manually assign static IP address to each virtual
server PC, with an address that does not fall into the range of IP addresses that are
to be issued by the DHCP server. You can configure the virtual server IP address
manually, but it must still be in the same subnet as the router.
Attention
Using port forwarding does have security implications, as outside users will be able to
connect to PCs on your network. For this reason you are advised to use specific
Virtual Server entries just for the ports your application requires, instead of using
DMZ. As doing so will result in all connections from the WAN attempt to access to
your public IP of the DMZ PC specified.
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Chapter 4: Configuration
123
Edit DMZ Host
The DMZ Host is a local computer exposed to the Internet. When setting a particular internal IP
address as the DMZ Host, all incoming packets will be checked by the Firewall and NAT
algorithms then passed to the DMZ host, when a packet received does not use a port number
used by any other Virtual Server entries.
Cautious:
This Local computer exposing to the Internet may face varies of security risks.
~
Disabled:
As set in default setting, it disables the DMZ function.
~
Enabled:
It activates your DMZ function.
Internal IP Address:
Give a static IP address to the DMZ Host when
Enabled
radio button is
checked.
Be aware that this IP will be exposed to the WAN/Internet.
Listed all existing PCs connecting to the network. You may assign a PC with IP
address and MAC from this list.
Select the
Apply
button to apply your changes.
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124
Edit One-to-One NAT (Network Address Translation)
One-to-One NAT maps a specific private/local IP address to a global/public IP address.
If you have multiple public/WAN IP addresses from you ISP, you are eligible for One-to-One NAT
to utilize these IP addresses.
NAT Type:
Select desired NAT type. As set in default setting, it disables the One-to-One NAT
function.
Global IP Address:
~
Subnet:
The subnet of the public/WAN IP address given by your ISP.
If your ISP has
provided this information, you may insert it here. Otherwise, use IP Range method.
~
IP Range:
The IP address range of your public/WAN IP addresses. For example, IP:
192.168.1.1, end IP: 192.168.1.10
Select the
Apply
button to apply your changes.
Check
to create a new One-to-One NAT rule:
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Chapter 4: Configuration
125
Time Schedule:
A self-defined time period to enable your virtual server.
You may specify a time
schedule or Always on for the usage of this Virtual Server Entry.
For setup and detail, refer to
Time Schedule
section
Application
: Users-defined description to identify this entry or click
to select existing
predefined rules.
:
20 predefined rules are available.
Click the Radio button to select the rule;
Application, Protocol and External/Redirect Ports will be filled after the selection.
Protocol
: It is the supported protocol for the virtual server. In addition to specifying the port
number to be used, you will also need to specify the protocol used. The protocol used is
determined by the particular application. Most applications will use TCP or UDP;
Global IP:
Define a public/ WAN IP address for this Application to use.
This Global IP address
must be defined in the
Global IP Address.
External Port:
The Port number on the Remote/WAN side used when accessing the virtual server.
Redirect Port:
The Port number used by the Local server in the LAN network.
Internal IP Address:
The private IP in the LAN network, which will be providing the virtual server
application.
List all existing PCs connecting to the network. You may assign a PC
with IP address and MAC from this list.
Select the
Apply
button to apply your changes.
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Chapter 4: Configuration
126
Example: List of some well-known and registered port numbers.
The Internet Assigned Numbers Authority (IANA) is the central coordinator for the assignment of unique
parameter values for Internet protocols. Port numbers range from 0 to 65535, but only ports numbers 0
to 1023 are reserved for privileged services and are designated as “well-known ports” (Please refer to
Table 5).
The registered ports are numbered from 1024 through 49151. The remaining ports, referred
to as dynamic or private ports, are numbered from 49152 through 65535.
For further information, please see IANA’s website at:
For help on determining which private port numbers are used by common applications on this list, please
see the FAQs (Frequently Asked Questions) at:
Table 5: Well-known and registered Ports
Port Number
Protocol
Description
20
TCP
FTP Data
21
TCP
FTP Control
22
TCP & UDP
SSH Remote Login Protocol
23
TCP
Telnet
25
TCP
SMTP (Simple Mail Transfer Protocol)
53
TCP & UDP
DNS (Domain Name Server)
69
UDP
TFTP (Trivial File Transfer Protocol)
80
TCP
World Wide Web HTTP
110
TCP
POP3 (Post Office Protocol Version 3)
119
TCP
NEWS (Network News Transfer Protocol)
123
UDP
NTP (Network Time Protocol)
161
TCP
SNMP
443
TCP & UDP
HTTPS
1503
TCP
T.120
1720
TCP
H.323
4000
TCP
ICQ
7070
UDP
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