I receive quite some, more than 200/sec, NTPv4 requestes on port 123 TCP, not UDP.
I am not sure what to make of this, as it happens on all servers I operate.
126.96.36.199.rev.vodafone.pt.37830 > loadbalancer.kashra-server.com.123: Flags [S], seq 3725917667, win 65535, options [mss 1412,sackOK,TS val 8256906 ecr 0,nop,wscale 12], length 0
Another, odd thing is the quite often seen ICMP echo/reply messages. It seems many people “ping” the pool for unknown reasons. Just curious though if you have the same experience with your servers.