Ip-Based Communication - Siemens SCALANCE W786-xPRO Operating Instructions Manual

Configuration / project engineering
5.1 Technical basics
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 (only for W746-1 and W747-1 or W746-1PRO and W747-1RR and W78x in client
mode)
If IP-based frames need to be sent to a device connected downstream from the client, the
default setting Adopt Own Mac 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).
Communication at the MAC address level (ISO/OSI layer 2) is then only possible with a
component downstream from the client if its MAC address was adopted by the client.
Maximum possible number of MAC nodes downstream from the client: 1
Layer 2 tunneling (only for W746-1 and W747-1 or W746-1PRO and W747-1RR and W78x in client
mode)
With layer 2 tunneling, 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 MAC nodes downstream from the client: 8
5.1.8

IP-based communication

IP mapping (only for W746-1 and W747-1 or W746-1PRO and W747-1RR and W78x in client mode)
If there is more than one device connected downstream from the client and these should
only be addressed with IP frames, you can implement WLAN access for several devices with
one client. With IP mapping, the client maintains a table with the assignment of MAC
address and IP address to forward incoming IP frames to the correct MAC address.
Maximum possible number of IP nodes downstream from the client: 8
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Operating Instructions, Release 08/2007, C79000-G8976-C221-02
SCALANCE W786-xPRO