Firewalled NTP on Redhat - ntpdate works, but ntpq doesn 't 2007-05-18 - By Young, Mike
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Yes, 123/UDP is open in both directions.
-- --Original Message-- --
From: redhat-list-bounces@(protected) [mailto:redhat-list-bounces@(protected)]
On Behalf Of Stephen Carville
Sent: Friday, May 18, 2007 3:01 PM
To: General Red Hat Linux discussion list
Subject: Re: Firewalled NTP on Redhat - ntpdate works, but ntpq doesn't
Young, Mike wrote:
> Hello,
>
> I'm seeing an odd NTP problem on a couple of Redhat servers here.
> Basically the NTP client is on a firewalled DMZ, away from the NTP server.
> NTP updates via ntpq work fine on the local NTP server subnet, but it
> isn't working for hosts on the firewalled DMZ. We've checked ports on the
> firewall, and 123/UDP is open. In addition, we see packets incrementing
> when we use the "iostat" command in ntpdc, and don't see any dropped or
> ignored packets in iostat either.
>
> Any ideas?
Does the firewall allow port 123 in _both_ directions? NTP requires
unrestricted access to 123/udp for _both_ source and destination.
> Thanks,
> Mike.
>
--
Stephen Carville <stephen@(protected)>
Systems Engineer
Land America
1.626.667.1450 X326
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