[ntp:questions] ntpd not responding to IPv6 queries?

Danny Mayer mayer at ntp.org
Tue Jun 9 11:45:15 UTC 2009

David J Taylor wrote:
> I have ntpd 4.2.4p6 running on a Windows 7 RC machine.
>>From the command prompt, when I enter:  ping <pc-name>, ping works 
> correctly, but seems to be using an IPv6 address.  I guess this must be an 
> auto-assigned address, as I have no IPv6 network as such.  If I enter: 
> ntpq -c rv <pc-name>, I get the error message:
>   ntpq: read: no such file or directory
> This PC is primarily an IPv4 pc, and if I enter the command with the IPv4 
> numeric address:  ntpq -c rv, it works as expected.  If I add an 
> entry to etc/hosts pc-name,  the ntpq -c rv <ip-name> works 
> correctly
> I can't reproduce the problem on a Windows Vista PC running ntp 4.2.5p181.
> So, with PCs having both IPv4 and IPv6 running, is there a difference 
> between ntp 4.2.4 and 4.2.5 which would explain such behaviour?

4.2.4 does not have IPv6 support on Windows while 4.2.5p181 does. Dave
Hart did report a problem with using ntpq over IPv6 on Windows but it
has not been debugged yet. I should check that on Unix as well.


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