[ntp:questions] Resolving Hostnames

Danny Mayer mayer at ntp.isc.org
Thu Dec 20 21:18:57 UTC 2007


Ronan Flood wrote:
> mayer at ntp.isc.org (Danny Mayer) wrote:
> 
>> Did you read http://support.ntp.org/bin/view/Dev/DNSServerFailover that
>> I pointed you to? When complete it WILL query the DNS again after a
>> period of failure.
> 
> An issue here (at my workplace we're rolling out IPv6 on our NTP
> servers): if a server has both IPv4 and IPv6 addresses (DNS A and
> AAAA records for the server name, as for example ntp.isc.org) and
> a client chooses the IPv6 address, will it fall back to the IPv4
> address if it fails to get a response over IPv6?  I believe that the
> current behaviour of ntpd is to choose only IPv6 if the client has
> IPv6 configured.  Potential problems would be lack of connectivity
> over IPv6 or incorrect "restrict"/firewall config.
> 

Currently no. That's one of the issues that need to get fixed.

Danny



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