NetModule NB3700, User Manual

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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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