D-Link DWS-1008 - AirPremier MobileLAN Switch Product Manual page 453

The condition-list specifies the match criteria for packets. Conditions in the list are ANDed. Therefore, to
be copied and sent to an observer, a packet must match all criteria in the condition-list. You can specify
up to eight of the following conditions in a filter, in any order or combination:
frame-type {eq | neq} {beacon | control | data | management | probe}
channel {eq | neq} channel
bssid {eq | neq} bssid
src-mac {eq | neq | lt | gt} mac-addr
dest-mac {eq | neq | lt | gt} mac-addr
host-mac {eq | neq | lt | gt} mac-addr
mac-pair mac-addr1 mac-addr2
To match on packets to or from a specific MAC address, use the dest-mac or src-mac option. To match
on both send and receive traffic for a host address, use the host-mac option. To match on a traffic
flow (source and destination MAC addresses), use the mac-pair option. This option matches for either
direction of a flow, and either MAC address can be the source or destination address.
If you omit a condition, all packets match that condition. For example, if you omit frame-type, all frame
types match the filter.
For most conditions, you can use eq (equal) to match only on traffic that matches the condition value.
Use neq (not equal) to match only on traffic that is not equal to the condition value. The src-mac, dest-
mac, and host-mac conditions also support lt (less than) and gt (greater than).
The observer ip-addr option specifies the IP address of the station where the protocol analyzer is
located. If you do not specify an observer, the AP radio still counts the packets that match the filter.
The snap-length num option specifies the maximum number of bytes to capture. If you do not specify a
length, the entire packet is copied and sent to the observer. D-Link recommends specifying a snap length
of 100 bytes or less. The following command configures a snoop filter named snoop1 that matches on
all traffic, and copies the traffic to the device that has IP address 10.10.30.2:
DWS-1008# set snoop snoop1 observer 10.10.30.2 snap-length 100
The following command configures a snoop filter named snoop2 that matches on all data traffic between
the device with MAC address aa:bb:cc:dd:ee:ff and the device with MAC address 11:22:33:44:55:66,
and copies the traffic to the device that has IP address 10.10.30.3:
DWS-1008# set snoop snoop2 frame-type eq data mac-pair aa:bb:cc:dd:ee:ff
11:22:33:44:55:66 observer 10.10.30.3 snap-length 100
D-Link DWS-1008 User Manual