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Monitoring Open Ports on an Interface

We currently have active connections from the IPs below to a third party.  When we perform maintenance we have the third party kill the connection.  Is there a way to monitor traffic on those specific ports and alert when there is no longer traffic to ensure the connection has been properly terminated?.

  1. 192.168.24.26:6570
  2. 192.168.24.26:6572
  3. 192.168.24.26:6574
  4. 192.168.24.26:6576
  5. 192.168.24.29:6571
  6. 192.168.24.29:6573
  7. 192.168.24.29:6575
  8. 192.168.24.29:6577
  9. 192.168.20.18:6565
  10. 192.168.20.18:6566