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Portmapping
You wish to access your PC from an external location via Internet. Normally, access via the firewall should be prohi-
bited. When you use port mapping, access to a router port that you have enabled is permitted from an external locati-
on. The router then forwards the access request to the defined port of the PC in the network. A fixed IP-address must
be assigned to this PC. When the PC returns data packets the IP address and port number of the PC are replaced by
the router with the number for the port mapping port and the router IP. For “outsiders” on the Internet it then appe-
ars as though there is only one connection to the router.
Note
Please note that when you use port mapping the firewall for the ports enabled for this function is ineffective. The
target PC in your LAN may then be susceptible to any potential attacks.
Port mapping is practical when you wish to run a game server on your own, for example.
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You can make this server accessible via the Internet to other users.
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Or, if you require certain peer-to-peer file sharing software that provides greater download bandwidth.
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When the corresponding PC in your LAN is to be accessible from the Internet (not possible in the standard
configuration with NAT). In this case, certain UDP and TCP ports must be rerouted to a PC in the LAN.
RAS-Server
Using the Remote Access Server (RAS) a field representative, for example, can call into the local network from an ex-
ternal location and then via the local network access the Internet. Access from an external location is also possible via
an ISDN connection.
External access is provided with user-name and password protection. If the call is made from an external location
only, the phone number can also be monitored as an added protection feature. Access can be enabled for several
users. A Windows enable (access to computer, files or printers) and Internet enable can also be configured for each
user.
Note
Note that this access portal is not protected by a firewall!
A PC that dials into the local network via RAS is automatically assigned an IP address by the integrated DHCP server.
Time-controlled router inhibition
With the aid of the calendar, or a manual function of the PABX system, you can set the time(s) of day when Internet
access is possible (permitted). These times are defined via the calendar assigned to the router in the configuration.
Here, it is stipulated that Internet connections can not be set up during night-time operation. You should therefore
set the switching times accordingly. Starting with Version 4 of system phones CS290/CS410, the telephones can be
switched using function keys on the phone; this setting is then retained until the next calendar-based switchover.
LAN-CAPI
The package includes a program called »CAPI for LANs« for use in your network. This software can be installed on
any PC in the network. This gives you the possibility of running your CAPI application from a central location via an
interface, i. e. the PABX system. There is no ISDN card required for the PCs. Please note that software used for the
CAPI application may require certain license agreements with the software manufacturer. The program »CAPI in
LAN« does not require a license to run.
Router functions Introduction
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