On 16/06/16 13:01, Daniel Stirnimann wrote:
(This was as part of "proving" that various O365 issues were client
side, not network-triggered)
If a resolver cannot resolve outlook.office365.com why should this be a
client side issue? Or do you mean the resolver is the client for
upstream queries?
I'm talking about completely unrelated client-side issues e.g. the
Outlook client just hanging for no readily apparently reason. These were
being blamed on "the network". As part of a long series of diagnostics,
I put this DNS monitoring in and left it running.
However, as it happens I *have* seen clients fail to resolve the name,
despite making a DNS query and being sent a reply by the server; IIRC it
was a machine with VirtualBox installed which just "broke". So you can
have client-side resolver issues in rare cases ;o)
Our resolvers for the Swiss NRENs log about 10 SERVFAILs for this domain
name each day. This is on BIND 9.9.9-P1 and BIND 9.11.0a3
Interesting. I wonder what the difference is?
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