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Manually Configuring your Modem
Manually Configuring your Modem
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Address Mapping
Use Address Mapping to
allow a limited number of
public IP addresses to be
translated into multiple
private IP addresses for
use on the internal LAN
network. This also hides
the internal network for
increased privacy and
security.
Port Forwarding
If you configure the Port
Forwarding settings,
remote users accessing
services such as web
or FTP at your local site
via public IP addresses
can be automatically
redirected to local servers
configured with private
IP addresses. In other
words, depending on
the requested service
(TCP/UDP port number),
the Modem redirects the
external service request to the appropriate server (located at another
internal IP address).
For example, if you set Type/Public Port to TCP/80 (HTTP or web)
and the LAN IP Address/LAN Port to 10.1.1.3/80, then all HTTP
requests from outside users will be transferred to 10.1.1.3 on port 80.
Therefore, by just entering the IP address 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.
Special Applications
Some applications, such
as Internet gaming,
video conferencing,
Internet telephony and
others, require multiple
connections. These
applications cannot work
with Network Address
Translation (NAT) enabled.
If you need to run
applications that require
multiple connections,
use the following screen
to specify the additional
public ports to be opened for each application.
Specify the public port number normally associated with an
application in the Trigger Port field. Set the protocol type to TCP
or UDP, and then enter the ports that the application requires. The
ports may be in the format 7, 11, 57, or in a range, e.g., 72-96, or a
combination of both, e.g., 7, 11, 57, 72-96.
Popular applications
requiring multiple ports
are listed in the Popular
Applications field. From
the drop-down list, choose
the application and then
choose a row number to
copy this data into.
Note: Choosing a row
that already contains data
will overwrite the current
settings.