Technical basics
3.4 NAT/NAPT
SCALANCE W760/W720 to IEEE 802.11n Web Based Management
Configuration Manual, 11/2014, C79000-G8976-C350-03
27
● iPCF and iPCF-MC are developments of Siemens AG and function only with nodes on
which iPCF / iPCF-MC is implemented.
● With an access point with several WLAN interfaces, it is possible to use both iPCF as well
as standard WLAN at the same time.
● Access points with a WLAN interface cannot take part in the iPCF-MC procedures, iPCF
is, however, possible.
iPCF-MC uses the two wireless interface of the access point in different ways: One interface
works as the management interface and sends a beacon every five milliseconds. The other
interface transfers the user data.
The following requirements must be met before you can use iPCF-MC:
● Only devices with two WLAN interfaces can be used as access points
● The data interface (WLAN1) and management interface (WLAN2) must be operated in
the same frequency band and must match in terms of their wireless coverage. iPCF-MC
will not work if the two wireless interfaces are equipped with directional antennas that
cover different areas.
● The management interfaces of all access points to which a client can change must use
the same channel. A client scans only this one channel to find accessible access points.
● Transmission based on IEEE 802.11h (DFS) cannot be used for the management
interface. 802.11h (DFS) is possible for the data interface.
● A client must support this feature on its WLAN interface.
iPCF-MC (Page 233)
NAT/NAPT
Layer 3 possible only with SCALANCE W722-1 RJ-45
The use of the layer 3 functions is possible only with the client SCALANCE W722-1 RJ-45.
With Network Address Translation (NAT), the IP address in a data packet is replaced by
another. NAT is normally used on a gateway between a private LAN and an external network
with globally valid IP addresses. A local IP address of the internal LAN is changed to an
external global IP address by a NAT device at the gateway.
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