Re: AD DNS subdomains fail when internet lost

So Kevin, are you saying that in our domain suffix search list we should
have:

internal.mycompany.com
printer.internal.mycompany.com
net.internal.mycompany.com

In my mind, this would make sense if we were referencing these devices by
hostname only. However when we reference printers, they are referenced by
printername.printers. Then when the suffix (internal.mycompany.com) is
appended, all is well.

So let me just re-itterate that under normal operation this works perfectly
well. It was just when we lost internet (and thereby lost external DNS) that
we lost the ability to reach these devices unless explicitly specifying the
FQDN. To ping printer1.printers would fail, but pinging
printer1.printers.internal.mycompany.com worked fine. Also, oddly, an
nslookup of printer1.printers successfully resolves. I have checked a couple
of the print servers and NetBIOS over TCP/IP is enabled.

Thoughts?


"Kevin D. Goodknecht Sr. [MVP]" <admin@xxxxxxxxxxxxxx> wrote in message
news:ukC6xfasHHA.4916@xxxxxxxxxxxxxxxxxxxxxxx
Read inline please.

In 2Deci.18421$vT6.12639@edtnps90">news:2Deci.18421$vT6.12639@edtnps90,
Trevor Christie <bbtrev@xxxxxxxxx> typed:
Yesterday, we lost our ISA server and while it was down, internal DNS
went in the toilet.

Our internal DNS is AD integrated. Our domain is
internal.mycompany.com (clients are set to append this suffix). We
have 2 subdomains, printers.internal.mycompany.com and
net.internal.mycompany.com. When the internet was lost, and therefore
external DNS was lost, clients became unable to contact resources in
either of the 2 subdomains by name unless they specified the fully
qualified name. We've since restored the internet connection, so
things are operating properly again, but there is obviously a
misconfiguration somewhere that I want to get resolved in case the
internet is lost again.

The only sure way for clients to resolve hostnames only in any domain, is
to
have all domains in which you want hostname only resolution listed in the
DNS suffix search list.
If internal.mycompany.com is the only suffix in your list, I would find it
strange that hosts in other domains would resolve in this one, unless you
have WINS lookup enabled or those hosts is registered in that zone.


--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This Helps

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