The ns.log file in the /var/log directory is not logging the SOURCE IP address of any client request going through a NetScaler appliance.
Run the following command to verify if the Source IP address is logged in the ns.log file:
root@ns# tail -f ns.log Aug 27 20:00:47 <local0.info> 10.217.245.231 08/27/2012:20:00:47 GMT 0-PPE-0 : TCP CONN_DELINK 4389 0 : Source 10.210.224.177:59839 - Vserver 10.217.245.233:80 - NatIP 10.217.245.232:17708 - Destination 192.168.10.1:80 - Delink Time 08/27/2012:20:00:47 GMT - Total_bytes_send 464 - Total_bytes_recv 64248 Aug 27 20:00:48 <local0.info> 10.217.245.231 08/27/2012:20:00:48 GMT 0-PPE-0 : TCP CONN_DELINK 4391 0 : Source 10.210.224.177:59839 - Vserver 10.217.245.233:80 - NatIP 10.217.245.232:17708 - Destination 192.168.10.1:80 - Delink Time 08/27/2012:20:00:48 GMT - Total_bytes_send 470 - Total_bytes_recv 240 Aug 27 20:00:48 <local0.info> 10.217.245.231 08/27/2012:20:00:48 GMT 0-PPE-0 : TCP CONN_TERMINATE 4392 0 : Source 10.210.224.177:59839 - Destination 10.217.245.233:80 - Start Time 08/27/2012:20:00:47 GMT - End Time 08/27/2012:20:00:48 GMT - Total_bytes_send 1 - Total_bytes_recv 1 Aug 27 20:01:00 <local0.info> 10.217.245.231 08/27/2012:20:01:00 GMT 0-PPE-0 : TCP CONN_TERMINATE 4410 0 : Source 10.210.224.177:59841 - Destination 10.217.245.233:80 - Start Time 08/27/2012:20:01:00 GMT - End Time 08/27/2012:20:01:00 GMT - Total_bytes_send 1 - Total_bytes_recv 1 Aug 27 20:01:00 <local0.info> 10.217.245.231 08/27/2012:20:01:00 GMT 0-PPE-0 : TCP CONN_TERMINATE 4411 0 : Source 10.210.224.177:59840 - Destination 10.217.245.233:80 - Start Time 08/27/2012:20:01:00 GMT - End Time 08/27/2012:20:01:00 GMT - Total_bytes_send 1 - Total_bytes_recv 1