FWIW, here's what I got on an Ubuntu 12.04.3 server running on my LAN. It looks like we should be fine with the defaults on Ubuntu at least. (Obviously always a

FWIW, here's what I got on an Ubuntu 12.04.3 server running on my LAN. It looks like we should be fine with the defaults on Ubuntu at least. (Obviously always a good idea to use ufw/iptables to block everything you don't need exposed so you don't have to worry about stuff like this). Before installing ntp (from another host on my LAN): $ ntpdc -n -c monlist 192.168.1.50 ntpdc: read: Connection refused After installing ntp (from another host on my LAN): $ ntpdc -n -c monlist 192.168.1.50 192.168.1.50: timed out, nothing received ***Request timed out After installing ntp (from the server itself): $ ntpdc -n -c monlist localhost remote address port local address count m ver rstr avgint lstint =============================================================================== 91.189.94.4 123 192.168.1.50 1 4 4 1d0 54 54 ...