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Wireless LAN – WLAN

BAT54-Rail/F..

Release

7.54

06/08

3.6

Client mode

Note: The number of clients which may be connected to an interface via

DHCP can be configured in the Port table under

Setup > LAN Bridge >

Port Data

. Setting the entry to '0' means that any number of clients can

ents is exceeded by a further attempt to register, the oldest entry in the list

is deleted.

When checking data packets, IP addresses and the IP network mask defined

in the rule are not used. Consequently no check is made as to whether the

destination IP address of the packet lies within the range specified. Instead,

a check is made as to whether the source IP address of the packet matches

the IP address assigned to the client via DHCP. The connection of the two IP

addresses is made based on the source MAC address.

This check can be used to block clients which have received an IP address

via DHCP, but which actually use a different IP address (either intentionally

or inadvertently). A rule in which the DHCP Source MAC parameter is set to

'Yes' would not apply since the two addresses do not match. The packet

would instead be processed either by other rules or the default rule.

In order for DHCP tracking to work, at least two more rules must be set up for

this interface, rules which are not dependent on DHCP tracking. This is nec-

essary since the required DHCP information is not exchanged until the end

of DHCP handshake. This is why packets due to be sent beforehand must be

allowed by rules which do not use DHCP tracking. These usually included

TCP/UDP packets on port 67 and 68 and ARP packets.

Note: If DHCP tracking is enabled on an interface, packets received on this

interface from HDCP servers are automatically dropped.

3.6 Client mode

To connect individual devices with an Ethernet interface into a wireless LAN,

BAT devices with a WLAN module can be switched to "client mode", where-

upon they act as conventional wireless LAN adapters and not as access

points (AP). The use of client mode therefore allows devices fitted with only

an Ethernet interface, such as PCs and printers, to be integrated into a wire-

less LAN.

Hirschmann BAT54-F Series User Manual

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