From: Rodolphe Pineau <pineau@rti-zone.org>

Date: October 4, 2009 10:45:16 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Re: Getting more accurate system clock times.

On Sun 10/4/09, at 17:59, milton_aupperle wrote:

Hi Rodolphe;

The issue I have with ntptrace is that it times out a lot on my Machines. I rarely ever get anything back except:

nothing received

***Request timed out

I'm not sure if it's because I have a fire wall enabled on my router or if the NTP server is too busy, but I find it not reliable.

TTYL..

Milton Aupperle

It is probably a firewall issue as the NTP protocol require port 123 (udp and tcp) to be open as the return channel for ntp queries uses the same port.

my example was done from behind a firewall (cisco router with nat enabled and access list to filter incoming packet) so unless you're actively blocking this port it should work. It off course depend on the routers and the implementation of the firewall.

Regards, Rodolphe

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