Scot L. Harris kirjoitti viestissään (lähetysaika tiistai, 31. elokuuta 2004 22:41):
If you stop and start iptables these ports are no longer open. I believe this would mean that ntp would stop working as expected.
No, the rule that accepts ESTABLISHED and RELATED packets lets ntp work correctly in the usual client/server mode. Punching holes in the firewall seems redundant, but in a previous discussion somebody claimed that it is required if broadcast NTP is used.