Compatible Systems 5.4 - Manual (Page 252)

246 Chapter 14 - General
<internal IP address>
This is the IP address on the internal network to be mapped to the
external IP address. It must be entered first, followed by " -> " or " = "
and the external IP address. The internal IP address must be within the
range (or ranges) of IP addresses defined by the Internal Range
Addresses. IP addresses must be specified in normal dotted-decimal
notation. If the rightmost components are 0, they are treated as wild cards
(e.g., 128.138.12.0 includes all devices on the 128.138.12 subnet).
<external IP address>
This is the IP address on the external network to be mapped to the
internal IP address. The external IP address must be within the range of
IP addresses defined by the External Range Addresses.
v Note: If only a single external IP address is available for the NAT router,
do not map that IP address to an internal IP address because you will no
longer be able to communicate with the router. Mapping single ports of the
single external IP address to internal IP address:port combinations (e.g.,
creating access to a web server in the internal NAT network) is acceptable,
however.
:<port>
The :port option allows an individual socket (IP address and port combi-
nation) to be mapped as part of a translation pair.
v Note: An IP address:port combination cannot be paired with an IP
address range (even if that range is a single IP address). It can only be paired
with another IP address:port combination.
/<bits>
The /bits option allows a range of IP addresses to be mapped as part of a
translation pair. The bits field denotes the top or most significant bits
which define the range. For example, an address specified as
192.15.32.0/19 would indicate a range from 192.15.32.1 to
192.15.63.255.
NAT Mapping Translation Pair Examples
The following example shows one IP address being translated into another.
[ NAT Mapping ]
10.5.3.20 -> 198.41.9.194
The following example shows individual sockets (IP address and port combi-
nation) being mapped as a translation pair.
[ NAT Mapping ]
10.5.3.10:80 -> 198.41.9.195:80