D-Link DWS-1008 User Manual page 403

DWS-1008 User's Manual
The following command shows statistics for snoop filter snoop1:
DWS-1008# show snoop stats snoop1
Filter
=============================================================
snoop1
Preparing an Observer and Capturing Traffic
To observe monitored traffic, install the following applications on the observer:
• Ethereal or Tethereal Version 0.10.8 or later
• Netcat (any version), if not already installed
Ethereal and Tethereal decode 802.11 packets embedded in TZSP without any
configuration.
Use Netcat to listen to UDP packets on the TZSP port. This avoids a constant flow of ICMP
destination unreachable messages from the observer back to the radio. You can obtain
Netcat through the following link:
http://www.securityfocus.com/tools/139/scoreit
If the observer is a PC, you can use a Tcl script instead of Netcat if preferred.
1. Install the required software on the observer.
2. Configure and map snoop filters in MSS.
3. Start Netcat:
•
•
Where ip-addr is the IP address of the Distributed AP to which the snoop filter is
mapped. (To display the Distributed AP's IP address, use the show dap status
command.)
4. Start the capture application:
• For Ethereal capture, use ethereal filter port 37008.
• For Tethereal capture, use tethereal -V port 37008.
5. Disable the option to decrypt 802.11 payloads. Because the AP always decrypts the
D-Link Systems, Inc.
Dap Radio Rx Match
3 1 96
On Linux or Unix, use a command such as the following:
nc -l -u -p 37008 ip-addr > /dev/null &
On Windows, use the following command:
netcat -u -p 37008 -v -v
Tx Match Dropped
4 0
Appendix A - Troubleshooting
Stop-After
stopped
398