understand ceph packets on the wire

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Hi,

With a one monitor one OSD test setup(osd pool default size = 1), I
captured the packets with tshark.
pcap.out file: https://ufile.io/43c78

The test I did was:
dd if=tmp.txt bs=512 count=1 of=/dev/rbd0 oflag=direct

About 350 packets were captured just for above simple "dd" command.

If you open the file with wireshark, you'll see packet #41 is the data packet.
"192.168.122.1" is the OSD and "192.168.122.131" is the rbd client.

What are other packets?

Thanks.
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