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̈ Chapter 11: Wireless LAN – WLAN LANCOM Reference Manual LCOS 3.50
209
Wireless LAN – WLAN
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 exten-
sion of a Wireless LAN is unlimited.
Base station as router
The LANCOM Wireless 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 connection
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 penetration
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
radio cell A
radio cell B
connection via
LAN
worksta-
…changes
into radio cell
Mobile station leaves
radio cell A and …