Siemens SIMATIC NET SCALANCE W760 Series Configuration Manual page 24

Technical basics
3.2 MAC-based communication
The access point checks whether the destination MAC address matches the MAC addresses
of the connected clients. Since a client can only adopt one MAC address, the access point
does not find a match and discards the packets of several nodes.
Maximum possible number of nodes downstream from the client: 1
Notes on the "Automatic" setting:
● As long as there is no link on the Ethernet interface, the device uses the MAC address of
the Ethernet interface so that it can be reached in this status. In this status, the device
can be found using the Primary Setup Tool and configured with WBM or CLI.
● As soon as there is a link on the Ethernet interface, the device adopts the source MAC
address of the first received frame.
Note
From the moment that the device adopts another MAC address (whether manually or
automatically), the device no longer responds to queries of the Primary Setup Tool when
the query is received over the WLAN interface. Queries of the PST over the Ethernet
interface continue to be replied to.
Adopt Own MAC
If IP-based frames need to be sent to a device connected downstream from the client, the
default setting "Own" can be retained. The client registers with the MAC address of its
Ethernet adapter. The IP packets are broken down according to an internal table and
forwarded to the connected devices (IP mapping).
Maximum possible number of nodes downstream from the client: 4
Layer 2 Tunnel
With a "Layer 2 Tunnel", the client provides information about the devices downstream from
it when it registers with an access point. This makes it possible to enter the MAC addresses
of these devices in the learning table of the access point. The access point can forward
MAC-based frames for the devices downstream from the client to the appropriate client.
In much the same way as with WDS, a separate port is created for the L2T client over which
the Ethernet frames are sent without changing the destination MAC address.
Maximum possible number of nodes downstream from the client: 4
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SCALANCE W760/W720 to IEEE 802.11n Web Based Management
Configuration Manual, 11/2014, C79000-G8976-C350-03