Westermo MRD-3x0 - Manual (Page 93)

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5.6 Custom NAT
5.6.1 Description
Custom NAT allow new rules to be added to the firewall to
carry out Network Address Translation (NAT) that is differ-
ent to the usual NAT provided by the firewall. Packets can
be matched based on which of the unit's network interfaces
they arrive on or will leave on, the protocol, the source or
destination address. The packets can have Source-NAT (SNAT)
applied, where the source address is altered, or Destination-
NAT (DNAT) applied, where the destination address is
altered.
Some example custom NATs are:
Source-NAT on all packets being transmitted out a •
VPN tunnel.
Destination-NAT to redirect packets to a host on the
LAN.
To access the Custom NAT configuration page, select the
Firewall tab from the main menu, then the Custom NAT tab
from the sub-menu. The page will list a table showing all
current custom NATs. When first selected the table will be
empty as shown in Figure 75.
Figure 75: Main custom NAT page, with no custom NAT entries in the table.