Routing and WAN connections
BAT54-Rail/F..
Release
7.54
06/08
11.4
IP masquerading
375
11.4.3 Free translation of TCP/IP ports on masked
connections
If IP masquerading is used over a connection, the IP address of the computer
in the local network is hidden behind the IP address of the router. So that in-
dividual computers in a LAN can still be contacted, inverse masquerading is
used whereby an incoming port range in the service table is assigned to a
particular IP address in the LAN.
On occasion it is desirable for the "exposed" host not to be contacted over
this standard port, e.g. when security reasons demand the use of another
port. In this case it is not only necessary to map the ports to an IP address,
but to translate between ports as well. Another example of port mapping is
the translation of multiple WAN ports to one common port in the LAN, but to
different IP addresses (N-IP mapping).
The configuration of port mapping involves the assignment of a port or port
range (start port to end port) to an IP address from the LAN as the target and
the port (map port) to be used in the LAN.
Note: If "0" is entered for the map port, the ports used in the LAN will be the
same as those used in the WAN. If a port range is to be mapped, then the
map port identifies the first LAN port to be used. For example, mapping
the port range '1200' to '1205' to the internal map port '1000' means that
the ports 1000 to 1005 will be used for data transfer in the LAN.
Note: Port mapping is static, meaning that two ports or port ranges cannot
be mapped to the same map port of a target computer in the LAN. The
same port mapping can be used for different target computers.
LANconfig
When using LANconfig for the configuration, you will find the service list in
the configuration area 'IP Router' on the 'Masq.' tab under the button Service
list.
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