[BUG] Issue with NTP seemingly not working right

[hgeaydem]

When deploying OSD it complains about one or two MONs having too high of a clock skew, showing the NTP config is not setup correctly

[ipilcher]

Easiest fix seems to be to simply add a rule to the iptables INPUT chain, for example:

iptables -I INPUT 6 -p udp -s 192.168.123.0/24 -m state --state NEW --dport 123 -j ACCEPT