Reverse address entries

[Novosielski, Ryan]

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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 in-addr.arpa 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.

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