Reverse address entries
dougb at dougbarton.us
Thu Jul 4 03:33:31 UTC 2013
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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 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.
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?
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