Reverse address entries

Novosielski, Ryan novosirj at
Tue Jul 2 16:37:50 UTC 2013

Hash: SHA1

On 07/02/2013 12:36 PM, John Horne wrote:
> On Tue, 2013-07-02 at 14:42 +0100, Sam Wilson wrote:
>> Can anyone here give examples of the types of various software
>> that will not operate without a PTR record?
> Nope, and our entire reverse zone was externally inaccessible for
> many months! (See previous posts on the bind9-users list from me
> about the problem.) As far as we could tell no services blocked us
> because of a failed reverse lookup. In fact it was one of the
> reasons we didn't immediately spot the problem.
> We were alerted to the problem because we got long delays (around
> 20 seconds) when accessing a site doing a reverse lookup. That
> service then, no doubt the same as with SMTP, then proceeded but
> without the reverse lookup answer.

In general, I wouldn't consider a 20 second delay an acceptable
compromise though.

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