Wilan LIBRA 5800 AP, User Manual

Page: 78 / 156

Configuration
78 Libra 5800 Series User Guide
IP/MBR Filter Configuration
IP filters help ensure that only valid subscribers use the wireless link. IP address filters are actually
tables that contain lists of IP addresses and masks on the local Ethernet. If an address is listed in the
table, the CPE will pass data packets to and from it. If the address is not defined by one of the filters,
the unit will not pass data packets to it or from it.
An IP address filter is defined by a range and a base value. IP address filtering improves system
security and helps manage data throughput.
The IP filter is created by combining the Subnet Mask and the IP Network address such that a binary
'1' in the subnet mask will preserve the corresponding digit in the IP Network address. For example
to filter on the range of addresses 192.8.62.0-255, a value of 192.8.62.0 would be entered as the IP
Network address and a value of 255.255.255.0 as the Subnet Mask. Alternatively to filter specifically
on the address 192.8.62.8, the values of 192.8.62.8 for the IP Network Address and
255.255.255.255 for the Subnet Mask would be entered.
The Maximum Burst Rate (MBR) option provides a means of limiting the maximum data rate on
individual CPE's. Use of this feature allows efficient management of the network by ensuring that
specific CPE's receive the level of service to which they are entitled.
Since the downstream Air link is broadcast, it is necessary to use MBR in conjunction with IP filtering.
This ensures that the maximum burst rate limit is applied only to data streams associated with the
particular CPE to which it is intended.Libra Unit
Setting the IP Filtering Option
You can set the IP Filtering Option to
Disable
to enable all data to pass through a CPE, or you can
set it to
Filter
to filter out certain IP address ranges defined in the IP Filter Configuration Menu.
The factory default is
Disable
. When set to
IP Filtering
, any packets other than IP and ARP
are rejected. When set to
IP Filtering with MBR,
the maximum burst rate for the CPE is
enforced in addition to filtering.
Note:
IP Filtering is always set to
disable
on AP units. It can be set to
Disable
or
IP Filtering
on CPEs.
IP Address Filter Table
xxx.xx.xx.x
xxx.xx.xx.x
xxx.xx.xx.x
Wire Air
Data packets pass only
if the IP address is
listed in the IP filter table
IP
Addresses