Napt; Napt Administration - NetModule NB3700 User Manual

NB3700 User Manual 3.8

5.5.4. NAPT

This page can be used to configure Network Address and Port Translation (NAPT) for
packets traversing the system. NAPT hereby modifies IP addresses or/and TCP/UDP
ports in matching IP packets. By tracking those connections, it will also automatically
adjust the returning packets of an IP session.
Figure 5.26.: NAPT Administration
The administration page lets you specify the interfaces on which outgoing NAT (also
called Masquerading) will be performed. NAT will hereby use the address of the selected
interface and choose a random source port for outgoing connections and thus enables
communication between hosts from a private local area network towards hosts on the
public network.
NAPT Inbound Rules
Inbound rules can be used to modify the target section of IP packets and, for instance,
forward a service or port to an internal host. By doing so, you can expose that service
and make it available from the Internet. You may also establish 1:1 NAT mapping for
a single host using additional outbound rules.
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