[time] My first problem client

Chris Stenton jacs
Wed Nov 26 16:59:40 UTC 2003


No I have not tried KOD as I thought that was over the top.

The client is using Version 3 and mode 1 which is active_symmetric.

Having seen that my own Win XP box looks the same, I would say that as an
educated guess it is a Win XP box that's been pointed to pool.ntp.org and
the registry key

\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\
NtpClient\SpecialPollInterval

changed to 16 seconds. I hope this is not a script that someone's put on the
net.

Having played with my own XP box and set the update to 1 second I can say
that w32time does not throttle
back when the server drops packets which is kind of scary if Win XP boxes
are pointed at the pool.

Chris

----- Original Message ----- 
From: "Tim Shoppa" <tshoppa at wmata.com>
To: <timekeepers at fortytwo.ch>
Sent: Wednesday, November 26, 2003 2:10 PM
Subject: Re: [time] My first problem client


> >Client 218.186.185.119 has deliberately set its minpoll maxpoll to 4.
> >Interestingly having changed the ntp config, so that packets get
> >discarded below 17 seconds average packet spacing, the client keeps
> >polling every 16 seconds regardless of its packets being dropped.
>
> I think that behavior would be expected for simple
> dropped packets and a not-unreasonable NTP client.
>
> The behavior from an unreasonable NTP client (like
> the Netgear/U Wisc episode)
> is to hammer even more heavily when packets are being dropped.
>
> Have you tried a Kiss-Of-Death yet?  What NTP version is the
> client identifying itself as?
>
> Most of all, remember that the user on that client machine
> probably doesn't realize his computer is doing this.  That's why
> it's important to try to determine the software/configuration
> that produces it, so we can "nip it in the bud".
>
> Tim.
>
> Chris
>
>
>
>
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