Westermo MRD-3x0 - Manual (Page 85)

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Source address
For greater security, the source addresses that the forward
will be applied to can be limited. In this field, either a single
address (for example, 172.16.1.132) or a subnet range (for
example, 172.16.0.0/24) can be entered.
Original destination port or range
This is the port number (80 in the example) but can also be a
range (entered as, for example, 120-150) that the firewall will
match on to forward to the new destination address.
New destination address
This is the IP address of the server to forward to
(192.168.2.230 in the example).
New destination port
In addition to changing the destination address, it is also pos-
sible to change the destination port. To do so, enter the port
in this field. This field can be left blank to keep the port the
same.
Insert this entry at position
Determines where this entry will be inserted in the list of
port forwards.