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NAT Section
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NAT Section
NAT Section
The
NAT (Network Address Translation)
section allows multiple users to access
the Internet sharing one public IP.
Figure 1 shows the
NAT
main screen.
FIGURE 1
NAT main screen
TABLE 1
NAT Settings
PARAMETER
DESCRIPTION
Enable
or
disable
NAT
module function
Turn on / turn off the NAT function
NAT >> ADDRESS
MAPPING
It allows one or more public IP addresses to be shared by multiple internal us-
ers. This also hides the internal network for increased privacy and security. En-
ter the
Public IP address
you wish to share into the Global IP field. Enter a
range of internal IPs that will share the global IP into “from” field.
Figure 2 represents Address configuration to share in public or global Internet.
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DISCUS™ DRG A124G
Address Mapping configuration
NAT >> VIRTUAL SERVER
If you configure the Router as a virtual server, remote users accessing services
such as web or FTP at your local site via public IP addresses can be automati-
cally redirected to local servers configured with private IP addresses. In other
words, depending on the requested service (TCP / UDP port number), the Rou-
ter redirects the external service request to the appropriate server (located at
another internal IP address).
In
Figure 3, the Router configuration working as
Virtual Server
is shown.
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DISCUS™ DRG A124G
Virtual Server Router configuration
For example, if you set
Type/Public Port
to TCP/80 (http or web) and the
Private
IP/Port
to 192.168.1.40/80 then all HTTP requests from outside users will be
transferred to 192.168.1.40 on port 80. Therefore by just entering the IP ad-
dress provided by the ISP, Internet users can access the service they need at
the local address to which you redirect them.
The more common TCP service ports include:HTTP:80, FTP:21, Telnet:23 and
POP3:110.
All list of ports is maintained at the following link:
NAT >> SPECIAL
APPLICATION
Some applications do require multiple connections, such as Internet gaming,
video conferencing and Internet telephony. These applications may not work
when
Networks Address Translation (NAT)
is enabled. If you need to run ap-
plications that require multiple connections, use there screens to specify the
additional public ports to be opened for each application.
Figure 4 shows the insertion of port (Trigger port) to open the inbound traffic for
special applications.
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DISCUS™ DRG A124G
Trigger port configuration for special application inbound traffic
TABLE 2
List of fields on the Special Applications menu
PARAMETER
DESCRIPTION
Trigger Port
Allows to open the inbound traffic for special application such as Internet
gaming, video conferencing, Internet telephony and others.
Trigger Type
Select TCP or UDP protocol.
Public port
Port towards network.
Public Type
Select TCP or UDP protocol.
Enabled
Enable / Disable the Trigger port.
Popular appli-
cations
To quickly copy the entry to the table.
NAT >> NAT MAPPING
TABLE
This section displays the current
NAPT (Network Address Port Translation)
address mapping (see
Figure 5).
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Network Address Port Translation table
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NAT Section
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