tcpdump rotating issue with newsyslog

Good Evening Community,

I am running the following command in the OpenBSD 6.2.

*"tcpdump -Nneqt -w tcpdump.pcap -i vic0 &"*

and using the following newsyslog.conf entry for rotating the tcpdump.pcap

# logfile_name owner:group mode count size when flags
/home/logs/tcpdump.pcap 644 5 10 * z

So when newsyslog checks and >=10KB size hits, the *tcpdump.pcap* file
will be rotated and *tcpdump.pcap.0.gz* will be created.

But after this, the size of the file is not increasing.

run the following command to check the file


*#tcpdump -r tcpdump.pcaptcpdump: bad dump file format*

*and the above tcpdump command is still running in the background.*

*So the question is the tcpdump have any issue with rotating the files with
newsyslog?*
*Or am I missing something?*
*Can you please suggest a solution for this?*



Thanks and Regards
Yogendra Kumar
National Institute of Technology,
Karnataka