[ntp:questions] Windows Time with NTPv4

Martin Burnicki martin.burnicki at meinberg.de
Wed Mar 12 09:47:00 UTC 2008


Ryan Malayter wrote:
> Okay, I just did some packet captures. It appears that Vista, when
> configured *only* with a time server host name or IP address, will
> first issue an NTP client mode request, and then an NTP symmetric
> active requirest a few miliseconds later.
> I imagine this default behavior is there to make w32time work in the
> same "broken" fashion that was used in Windows 2000. Backwards
> compatability is a bitch. 


> Do Windows 2000 domain controllers ignore 
> client-mode packets or someting? I don't have one to test with.

I don't have, either, and I've never tried to find out to which type of NTP
packets w32time responds.
> When a Vista machine is explicitly configured to use a client mode
> association, like so:
>    w32tm /config /manualpeerlist:pool.ntp.org,0x8
> it issues only client-mode queries, as you would expect.

That's what we suggest in our FAQ article mentioned in my earlier post.

Martin Burnicki

Meinberg Funkuhren
Bad Pyrmont

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