Local Servers (Port Forwarding) - Option Audio GlobeSurfer 3G Reference Manual

5.3 Local Servers (Port Forwarding)

In its default state, GlobeSurfer 3G blocks all external users from connecting
to or communicating with your network. Therefore the system is safe from
hackers who may try to intrude on the network and damage it. However,
you may want to expose your network to the Internet in certain limited and
controlled ways in order to enable some applications to work from the LAN
(game, voice and chat applications, for example) and to enable Internet-access
to servers in the local network. The Local Servers feature supports both of these
functions. If you are familiar with networking terminology and concepts, you
may have encountered this topic referred to as "Port Forwarding".
The Local servers tab shows the most commonly used applications that require
special handling by GlobeSurfer 3G—all you have to do is identify which of
them you want to use and the local IP address of the computer that will be
using the service. For example, if you wanted to use the Net2Phone voice
application on one of your PCs you would simply select Net2Phone from the
list and enter the local IP address or host name of that computer in the right-
hand column. All Net2Phone-related data arriving at GlobeSurfer 3G from the
Internet will henceforth be forwarded to the specified computer.
Similarly, if you want to grant Internet users access to servers inside your local
network, you must identify each service that you want to provide and the PC
that will provide it. For example, if you want to host a Web server inside the
local network you must select HTTP - Web server from the list and enter the
local IP address or host name of the computer that will host the Web server
in the right-hand column. Then when an Internet user points her browser to
the external IP address of GlobeSurfer 3G, it will forward the incoming HTTP
request to the computer that is hosting the Web server.
Additionally, Local servers enable you to redirect traffic to a port different than
the port it was designated. Lets say, that you have a web server running on
your PC on port 8080 and you want to grant access to this server to anyone
who accesses GlobeSurfer 3G via HTTP. To accomplish this, do the following:
• Define a local server for the HTTP service, with the PC's IP or host name.
• Specify 8080 in the Forwarded port field.
All incoming HTTP traffic will now be forwarded to the PC running the web
server on port 8080.
Figure 5.6: Local Servers
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