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Wednesday, July 05, 2006

Identifying incoming traffic using Data ONTAP Classic pktt

The task: Identifying thru which interface/s incoming traffic is arriving to the filer?

There are different methods to find out such information:
1. Send traffic from a particular client, and use the following command:
   pktt start all -b 2m -d / -s 5m -i 
   

If this client is sending traffic, you will see messages stating packets seen. You can also check if packets have been observed from this client using:
   pktt status -v
   

2. Capture a network trace file and observe. Capture using the same filer utility as described above. The files will end up in the filer's /, and only administrator/root can read the files:
To start the trace on all interfaces:
   pktt start all -b 2m -d / -s 5m
   

To stop the trace:
   pktt stop all
   


Dr. Toaster Recommends:
Use Ethereal to decode the network trace file. Ethereal decodes all the common file and block protocols - NFS, CIFS, iSCSI, as well as management protocols such as RSH, SNMP, Telnet.