query issue

Kevin Darcy kcd at chrysler.com
Thu Mar 29 16:59:47 UTC 2012

On 3/29/2012 11:45 AM, Anand Buddhdev wrote:
> On 29/03/2012 17:35, Paul A wrote:
> Hi Paul,
>> However when I query kingstonmass.org I don't see any returned answer and it
>> eventually times out.
>> 11:03:34.310559 2002:c690:8cc6:c:206:5bff:fe8e:334d.54795>
>> b2.org.afilias-nst.org.domain:  54297 NS? kingstonmass.org. (34)
>> Again when querying this with my other DNS server it works fine. On the
>> server I'm having issues with I can ping all the pingable org servers and
>> the NS servers for the domain in question.
> I notice that the query is going out with an IPv6 source address.
Specifically, a 6to4 address, with (otherwise known as 
c690:8cc6) as the IPv4 endpoint of the tunnel. This was originally 
specified in RFC 3056 (http://www.rfc-editor.org/rfc/rfc3056.txt), but 
more recently there has been an informational RFC 
(http://www.rfc-editor.org/rfc/rfc6343.txt) enumerating the many 
problems associated with 6to4, and casting doubt on its long-term 
viability as an IPv4-to-IPv6 transition mechanism

             - Kevin

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