John Clarke wrote:
On Thu, Sep 16, 2004 at 11:23:07 +1000, Rod Butcher wrote:
Mandrake 10 provides a user-friendly install for NTP time server
connection but it doesn't seem to actually adjust my time.. the modem
light flickers but time doesn't change. I've tried uadelaide.edu.au and
Check your firewall rules. You need to allow ntp (port 123 udp) in and
out.
I don't know mandrake but I got the impression that it's standard
practice to have a rule like:
# allow established connections, or related packets
iptables --append block --match state --state ESTABLISHED,RELATED
--jump ACCEPT
which will allow a replying NTP packet pass through. That's much
more convenient (and secure, IMHO) than completly opening the NTP port.
(in case you want to check if such a rule exists, the iptables -L output
for it looks like:
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
)
Cheers,
--Amos
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