What the hell is choking my bandwidth? Ntop graphs

Big on Hosting. Unlimited Space & Unlimited Bandwidth

I’ve noticed that in 30 minute intervals, one of my VPS’s suddenly has a huge upload spike that takes all upload bandwidth. If I manually ban the IP, it happens again on a different IP.

This is accompanied by CPU usage and a loss of service. The VPS is cpanel behind an IPS/NAT.

Is this some type of brute force attack? All of the CMS logins are secured and are on a 3 attempt time-out for 15 minutes.

If anyone can help me solve the issue at the network layer and stop this, I will make sure to donate

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