Wireless LAN – WLAN
28
3.1
What is a Wireless LAN?
BAT54-Rail/F..
Release
7.54
06/08
In the example above, the roaming function of the mobile station enables the
access to the workstation in radio cell A also after changing into radio cell B.
After the radio cell change, the base station in radio cell B passes on the data
of the mobile station via LAN to the base station in radio cell A. From there,
they arrive via radio at the workstation in radio cell A. In this way, the connec-
tion between both devices remains existing at any time.
A Wireless LAN can consist of as many as desired radio cells. Thus the ex-
tension of a Wireless LAN is unlimited.
U Base station as router
The BAT Wireless Router base station possesses a WAN connector for all
current broadband modems with cable-bound Ethernet connection (DSL or
cable modem). In this operation mode, the base station offers all functions of
a complete IP and IPX router as well. The base station serves in this connec-
tion variant as gateway to the Internet. The router checks for all received data
packets whether they need to be transferred to another network or worksta-
tion. The router itself establishes the connections as required.
The integrated Stateful Inspection Firewall prevents effectively the penetra-
tion of undesired data traffic into the own network by permitting incoming data
only as reaction to outgoing data traffic. For accessing the Internet, the IP
masquerading function of the router hides all workstations of the LAN behind
a single public IP address. The real identities (IP addresses) of the individual
workstations remain concealed. Firewall filters of the router permit specific IP
addresses, protocols and ports to be blocked. With MAC address filters it is
also possible to specifically control the access of workstations in the LAN to
the IP routing function of the device.
radio cell A
radio cell B
connection via
LAN
workstation
… changes into radio
cell B.
Mobile station leaves ra-
dio cell A and …
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