[AusNOG] Optusnet Resolver issues.

[Lincoln Dale]

On Tue, May 29, 2012 at 11:54 AM, Matt Taylor <matt at mt.au.com> wrote:

>
> Any chance someone from Optus can contact me off-list in relation to their
> resolvers (211.29.132.12/198.142.0.51/**61.88.88.88<http://211.29.132.12/198.142.0.51/61.88.88.88>)
> returning SERVFAIL's for a domain which is actually active.
>

It is valid for a caching nameserver to cache a negative DNS response,
including SERVFAILs, albeit only for a limited time.  but it may well be
that their caching nameservers are somehow blocked from talking to whatever
your authoritive servers are, hence keep re-(negative)-caching that lack of
connectivity.

In either case, if its a problem give the Optus NOC or their tech support a
call, probably quicker.


cheers,

lincoln.
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