RCA 608WL - Manual (Page 150)

Chapter 5
Expert Configuration
E-DOC-CTC-20041126-0013 v1.0
148
5.3.6 NAT
Introduction Network address (and Port) translation (NAPT) is a technique used to share one IP
address amongst several computers. For most common applications, enabling NAPT
on a specific interface is adequate. From then on, all clients behind the NAPT router
automatically share the same IP address. To run one or more servers behind a NAPT
router, extra configuration is needed. On the NAPT page, you can specify these
settings.
Overview The NAT menu consists of following sections:
 Interfaces
 Mappings
 Templates
Interfaces The Interface page allows you to enable/disable NAPT on a specific interface.
Proceed as follows to enable/disable an interface:
1 Select the interface that has to be enabled/disabled
2 Click Save All to make the settings permanent.
Mappings The Mappings page allows you to map one or more private IP addresses into one or
more public IP address on a specific interface.
Depending on your needs following fields are available:
 Interface
:
The name of the IP interface that needs to be NAT-ed.
 Protocol :
The IP protocol on which address translation has to be applied. This allows the
SpeedTouch™ to link specific traffic (protocol dependent) to a chosen private
host.
 Outside address :
The outside (typically public) IP address(es).
 Inside address
:
The inside (typically private) IP address(es).
 Access list
:
You can use the access list to define the address(es) that are allowed to use the
outbound connections.
 Foreign address
:
Foreign address is to define the address(es) that are allowed to use the inbound
connections.
If you selected NAPT, you will have to specify a port range for the inside and
outside address.