Re: Setting Up NTP for Time Sync
From: W. Watson (wolf_tracks_at_invalid.inv)
Date: 01/09/05
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Date: Sun, 09 Jan 2005 17:41:34 GMT
Bill Unruh wrote:
> On Sun, 9 Jan 2005, W. Watson wrote:
>
>> Bill Unruh wrote:
>>
>>> I suspect Strongly that it does not. See the web page
>>> http://geodsoft.com/howto/timesync/wininstall.htm
>>> which a) suggests to me that windows does NOT support server, and b)
>>> gives software that you can install which makes it into a server.
>>> Now, whether (NetTime) SNTP will interoperate with NTP on the linux
>>> machines I do
>>> not know.
>>
>> I have two web pages that need examination that may tell the story. In
>> the mean time,
>> see tcpdump below.
>
>
> What the tcp dump says is that the remote machine (0.3-- the windows
> machine I assume) never replies. I suspect very strongly that it does
> not support ntp as a server.
>
>>
>>> Again, I have no idea what your accuracy requirement is. If it is +- 1
>>> sec, then sntp and your windows solution would be fine. If it is +- ms,
>>
>> I'm assuming that by sntp you are referring to the material I
>> discovered with the net time command?
>
>
> NetTime impliments sntp, the simple network time protocol. The linux
> machine's ntp supports the full ntp protocol.I do not know if the linux
> full protocol can use an sntp server to get the time.
>
>
>> While time accuracy is of interest, I will put it aside until I really
>> have this problem about NTP nailed to the wall.
>
>
> Well, it would surely be best to impliment a strategy which will
> ultimately give you what you need.
>
>>>
>>> I am still unclear what your topology is. You seems to say that the win
>>
>> I'm beginning to think it's a Klein bottle. :-)
>>
>>> machine has a direct connection to the net, but the Linux machine can
>>> connect only via phone modem but it has a direct connection to the win
>>
>> The machine I'm currently using for Linux is a test bed. The *final*
>> machine for my application will not have a modem.
>>
>>> machine. Why do you not switch them around. Have the Linux machine have
>>
>>
>
> OK. I did not want to suggest a modem. So what you have is an ethernet
> connection between your linux machine and your windows machine. What do
> you use to to connect your Windows XP machine to the net? Is it a modem?
> Is it a DSL connection via the phone company? Is it a cable modem?
>
> Anyway, what you really want to do then is to make your windows machine
> act as a router for your Linux machine. Ie the Windows machine will
> accept the stuff from your linux machine, do address translation and
> send the stuff onto the net. That way your Linux machine will be
> directly connected to the net, whenever your Windows machine is, and can
> use ntp directly from the net, and you can forget all about your windows
> machine as an ntp server.
>
> Looking up google, the web page
> http://www.no-ip.com/tips.php/id/4
> seems to give a guide to setting up the windows machine as a router for
> the Linux machine.
>
> Note that you say that you at present have your linux box as a test bed
> and will be putting a different machine there. Why not use your test bed
> as a router for the whole system-- Ie move it to the house and have it
> distribute the internet to everything else? Alternatively make your
> windows machine into a router for the linux
> machine.
>
>
>> I have no interest in putting a modem on the "final" Linux box. The
>> machine is just a box that is operating 24/7 to trigger an all sky
>> video camera to capture fireball (meteor) images it detect crossing
>> the sky. I do not need it connected to the internet all day. I'm
>> practically on the internet all day on the XP machine. Let it catch
>> the time from the internet, and let Linux update its clock. If this
>> doesn't work, then I'll try something else.
>>
>> Note all my linux machines are in my observatory 100' away from the
>> XP. An ethernet cable runs to them from the house where the XP machine
>> is located. These statements have no particular bearing on the above,
>> but maybe it will help you understand some of the topology.
>
>
> Yes, they do. Now how does your XP machine connect to the outside net?
>
>>
>>> a direct connection to the net and to the win machine, and then have it
>>> do masquarading for the win machine so it too will have a direct
>>> connection tot he net. Then it can easily act as a time standard for
>>> the win machine, and you will know it is accurate to ms. And both will
>>> have connections to the net.
>>>
>>>
>>>
>>>
>> The results of tdpdump while requesting time via redhat-config-date are:
>
> These just show that the Win machine never answers, making me suspect
> strongly that there is no ntp server running on the Win machine.
If so, then I will switch gears to the web page that suggests NTP can be made
available to XP by modifications to the registry. See
<http://support.microsoft.com/default.aspx?scid=kb;en-us;314054>. If that fails, then
I'll consider getting time from my partner's network at Sierra College. I suspect
that will get me in the ball park with his time. And if that fails, then I will
likely request that Sandia Labs (they are behind this app) buys me a board with an
atomic clock on it. But I'm open to suggestions.
Thanks for the suggestions.
I just offically ended this thread. You should have just received notification.
Where is UBC? What sort of physics do you do?
--
Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
Web Page: <home.earthlink.net/~mtnviews>
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