Nortel Networks NN47250-500 Capturing system information and sending it to technical support

788 Appendix A:Troubleshooting a WSS
NN47250-500 (Version 03.01)
If the observer is a PC, you can use a Tcl script instead of Netcat if preferred.
1Install the required software on the observer.
2Configure and map snoop filters in WSS Software.
3Start Netcat:
●On Linux, use a command such as the following:
nc -l -u -p 37008 ip-addr > /dev/null &
●On Windows, use the following command:
netcat -l -u -p 37008 -v -v
Where ip-addr is the IP address of the AP to which the snoop filter is mapped. (To display the AP’s IP
address, use the show ap status command.)
4Start the capture application:
●For Ethereal capture, use ethereal filter port 37008.
●For Tethereal capture, use tethereal -V port 37008.
5Disable the option to decrypt 802.11 payloads. Because the AP always decrypts the data before sending it
to the observer, the observer does not need to perform any decryption. In fact, if you leave decryption
enabled on the observer, the payload data becomes unreadable.
To disable the decryption option in Ethereal:
aIn the decode window, right-click on the IEEE 802.11 line.
bSelect Protocol Preferences to display the 802.11 Protocol Preferences dialog.
cClick next to Ignore the WEP bit to deselect the option. This option is applicable for any type of
data encryption used by AP radios.
6Enable the snoop filter on the AP, using the following command:
set snoop {filter-name | all} mode {enable [stop-after num-pkts] | disable}
7Stop the Ethereal capture and view the monitored packets.
The source IP address of a monitored packet identifies the AP that copied the packet’s payload and sent it
to the observer.
Capturing system information and sending it to
technical support
If you need help from the Nortel Enterprise Technical Support (NETS) to diagnose a system problem, you can make
troubleshooting the problem easier by providing the following:
•show tech-support output
• Core files
• Debug messages
• Description of the symptoms and network conditions when the problem occurred
The following sections show how to gather system information and send it to NETS.