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Huge daily outbound network traffic


Hi,
I have a 3 node Cassandra cluster (version 3.11.1) on m4.xlarge EC2 instances with separate EBS volumes for root (gp2), data (gp2) and commitlog (io1).
I get daily outbound traffic at a certain time everyday. As you can see in the attached screenshot, whiile my normal networkl oad hardly meets 200MB, this outbound (orange) spikes up to 2GB while inbound (purple) is less than 800MB.
There is no repair or backup process giong on in that time window, so I am wondering where to look. Any idea?

Attachment: cassandra-networkOut.png
Description: PNG image

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