[ntp:questions] Windows Time with NTPv4

David L. Mills mills at udel.edu
Wed Mar 12 13:58:43 UTC 2008


Martin,

Maybe so, but when I tried both XP and Vista before the change I 
mentioned, both timed out and did not work.

Dave

Martin Burnicki wrote:
> Ryan,
> 
> 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. 
> 
> 
> Yep.
> 
> 
>>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




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