Xirrus XR Series User Manual

Wireless Access Point
The Command Line Interface 467
If you select all, the rules shown in Figure 215 are added to the predefined filter
list named Global. These rules assume that you have station-to-station blocking
enabled, that a DHCP server is on the AP’s wired connection, and that you want
to block most all multicast and all broadcast traffic not vital to normal operation.
If you find that there is a particular type of multicast or broadcast traffic that you
want to allow, just add a specific allow filter for it before the deny filter in this list
that would normally block it. Add or delete any of the Multicast rules as
necessary for a specific site. Remember that the order of the rules is important.
Figure 215. Air Cleaner Filter Rules
Explanations of some sample rules are below.
 Air-cleaner-Arp.1 blocks ARPs from one client from being transmitted to
clients via all of the radios. The station to station block setting doesn't
block this traffic, so this filter eliminates this unnecessary traffic.
 Air-cleaner-Dhcp.1 drops all DHCP client traffic coming in from the
Gigabit interface. This traffic doesn't need to be transmitted by the radios
since there shouldn't be any DHCP server associated to the radios and
offering DHCP addresses. For large subnets the DHCP discover/request
broadcast traffic can be significant.
 Air-cleaner-Dhcp.2 drops all DHCP server traffic coming in from the
radio interfaces. There should not be any DHCP server associated to the

Xirrus XR Series Specifications

General

Brand	Xirrus
Model	XR Series
Category	Wireless Access Point
Language	English