Reverse address entries

Novosielski, Ryan novosirj at
Thu Jul 4 04:52:38 UTC 2013

Hash: SHA1

On 07/03/2013 11:33 PM, Doug Barton wrote:
> On 07/03/2013 07:52 PM, Novosielski, Ryan wrote: | On 07/03/2013
> 04:39 AM, Matus UHLAR - fantomas wrote: |> On 02.07.13 08:53,
> Daniel McDonald wrote: |>> I've had trouble with OSI-Soft PI
> historian without reverse |>> entries.  If there is no reverse,
> then the PI software would |>> spend about 30 seconds looking in
> vain for a DNS answer before |>> sending a SYN-ACK packet. | |> If
> there is no reverse, the software should get NXDOMAIN answer. in |>
> such case there's nothing to wait for any longer. Are you sure
> that |> was not a case of unreachable servers? | | Something I just
> stumbled over today (funny that it was during this | topic) is that
> there is a Cisco ASA issue that makes reverse queries | against
> anything but fail with a timeout. Unfortunately, |
> some things check IN-ADDR.ARPA (why on earth?) and the lack of
> that | entry is apparently causing mail delivery problems.
> It's not clear what distinction you're making. DNS should not be
> case sensitive, or is that what you're saying the problem is?

Sorry I wasn't that clear -- the issue that we're having is that the
reverse DNS is not available. The reason happens to be case
sensitivity and problem with the Cisco firewall we're using -- not a
choice not to include those entries -- but in any case, it is an
example of what can happen when your reverse entries are not properly

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