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1. Execute the following command.

   Code Block
   tcpdump -Z root -i any -s65535 -G 3600 -vnn udp port 5050 or port 5060 -w /usr/local/voipnow/admin/htdocs/'output_%Y-%m-%d_%H:%M:%S.pcap'

   
   

2. The output of the above command will be a file named: output_2015-02-25_07:37:18.pcap. 
3. The capture is automatically rotated according to the values specified in -G parameter. In this example, a new file is created every 3600 seconds; the only limit is the disk space available.

4. To limit the number of captures produced, insert the -W parameter where the number of the captures can be specified.

   Code Block
   tcpdump -Z root -i any -s65535 -G 3600 -vnn udp port 5050 or port 5060 -W 10 -w /usr/local/voipnow/admin/htdocs/'output_%Y-%m-%d_%H:%M:%S.pcap'

   
   

5. The command above produces 10 captures, as specified by the -W parameter. A new capture is created every 3600 seconds (the -G parameter). After 10 captures, the command will be automatically stopped.

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