Resolved: Misuse of NL NTP Pool Servers (nl.pool.ntp.org) by misconfigured Devolo 650 powerline adaptors sold by KPN (NL)

Server operators
3

That’s why this is happening…

(note: 100.100.100.250 is a substitute for my public IPv4)

Apr 21 20:32:38 block igb0 UDP 84.85.254.10:15654 100.100.100.250:37
Apr 21 20:32:38 block igb0 UDP 84.107.154.206:44707 100.100.100.250:37
Apr 21 20:32:38 block igb0 UDP 86.82.234.240:6578 100.100.100.250:37
Apr 21 20:32:42 block igb0 UDP 84.85.254.10:15654 100.100.100.250:37
Apr 21 20:32:42 block igb0 UDP 84.107.154.206:44707 100.100.100.250:37
Apr 21 20:32:42 block igb0 UDP 86.82.234.240:6578 100.100.100.250:37
Apr 21 20:32:42 block igb0 UDP 86.84.54.215:44609 100.100.100.250:37
Apr 21 20:32:43 block igb0 UDP 77.161.195.234:51727 100.100.100.250:37
Apr 21 20:32:46 block igb0 UDP 84.85.254.10:15654 100.100.100.250:37
Apr 21 20:32:46 block igb0 UDP 77.249.93.9:52164 100.100.100.250:37
Apr 21 20:32:46 block igb0 UDP 84.107.154.206:44707 100.100.100.250:37
Apr 21 20:32:46 block igb0 UDP 86.82.234.240:6578 100.100.100.250:37
Apr 21 20:32:47 block igb0 UDP 86.94.122.133:44588 100.100.100.250:37
Apr 21 20:32:50 block igb0 UDP 84.85.254.10:15654 100.100.100.250:37
Apr 21 20:32:50 block igb0 UDP 84.107.154.206:44707 100.100.100.250:37
Apr 21 20:32:50 block igb0 UDP 86.82.234.240:6578 100.100.100.250:37
Apr 21 20:32:54 block igb0 UDP 84.85.254.10:15654 100.100.100.250:37
Apr 21 20:32:54 block igb0 UDP 84.107.154.206:44707 100.100.100.250:37
Apr 21 20:32:55 block igb0 UDP 86.82.234.240:6578 100.100.100.250:37
Apr 21 20:32:55 block igb0 UDP 86.84.54.215:31496 100.100.100.250:37
Apr 21 20:32:55 block igb0 UDP 77.161.195.234:27542 100.100.100.250:37
Apr 21 20:32:58 block igb0 UDP 84.85.254.10:15654 100.100.100.250:37
Apr 21 20:32:59 block igb0 UDP 84.107.154.206:44707 100.100.100.250:37
Apr 21 20:32:59 block igb0 UDP 77.249.93.9:16006 100.100.100.250:37
Apr 21 20:32:59 block igb0 UDP 86.82.234.240:6578 100.100.100.250:37
Apr 21 20:32:59 block igb0 UDP 86.94.122.133:60926 100.100.100.250:37
Apr 21 20:33:03 block igb0 UDP 84.85.254.10:15654 100.100.100.250:37
Apr 21 20:33:03 block igb0 UDP 86.82.234.240:6578 100.100.100.250:37
Apr 21 20:33:03 block igb0 UDP 84.107.154.206:44707 100.100.100.250:37
Apr 21 20:33:08 block igb0 UDP 84.85.254.10:15654 100.100.100.250:37
Apr 21 20:33:08 block igb0 UDP 84.107.154.206:44707 100.100.100.250:37
Apr 21 20:33:08 block igb0 UDP 86.82.234.240:6578 100.100.100.250:37
Apr 21 20:33:09 block igb0 UDP 86.84.54.215:48186 100.100.100.250:37
Apr 21 20:33:09 block igb0 UDP 77.161.195.234:2231 100.100.100.250:37