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

David Lord snews at lordynet.org
Tue Jun 9 07:24:13 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?

Don't know too much on windows but on NetBSD I only have ipv6 routing
from one pc but find various services fail if the destination has an
ipv6 address. All of these services have a "-4" option which prevents
attempting the ipv6 connection first. I only have a problem with one
particulatr remote ntp server which uses ipv6 ok when accessed from
ipv6 capable pc, but requires "server -4 hostname" to work on other
pcs on the lan.


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