[ntp:questions] NTPD not receiving any response from timservers
kostecke at ntp.isc.org
Mon Nov 6 21:58:35 UTC 2006
On 2006-11-06, lingsmail at gmail.com <lingsmail at gmail.com> wrote:
> I'm trying to set up NTPD on a gentoo box to serve time to my network.
> Needless to say, it's not working. It remains as a stratum 16 server,
> because it is not syncing.
> remote refid st t when poll reach delay offset jitter
> ntp.demon.co.uk .INIT. 16 u - 64 0 0.000 0.000 0.000
> box2.martinradf .INIT. 16 u - 64 0 0.000 0.000 0.000
> hall.inhouse-so .INIT. 16 u - 64 0 0.000 0.000 0.001
This is showing that your ntpd has not received any NTP packets from
those time servers.
And here's why:
> server ntp.demon.co.uk prefer iburst
> restrict 220.127.116.11 nomodify NOSERVE
> server 18.104.22.168 iburst
> restrict 22.214.171.124 nomodify NOSERVE noquery notrap
> server 126.96.36.199 iburst
> restrict 188.8.131.52 nomodify NOSERVE noquery notrap
noserve == Deny all packets except ntpq and ntpdc queries.
noquery == Deny all ntpq and ntpdc queries.
You've told ntpd to completely ignore your time servers. Try removing
the noserve and restarting ntpd.
Please take a look at http://ntp.isc.org/Support/AccessRestrictions (a
HOWTO-style document for configuring your ntpd access restrictions) and / or
http://www.eecis.udel.edu/~mills/ntp/html/accopt.html (the official
Access Control Options documentation).
> As an aside, how do I prevent ntpd from listening on a particular
Use your firewall (i.e. iptables) to block port 123/UDP on that
Use restrict statements to control what IP addresses / subnets are able
to access your ntpd.
Steve Kostecke <kostecke at ntp.isc.org>
NTP Public Services Project - http://ntp.isc.org/
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