Bob Harold wrote:
> I recall running into applications that refused to accept connections (or
> took a very long time) if the reverse DNS lookup was not found.  If memory
> serves, telnet and ssh on some hosts.  Do we know if there are still
> applications like that?

Ubuntu has a long-standing bug that causes a 5-second delay in any
reverse lookup that yields NXDOMAIN:

  https://bugs.launchpad.net/ubuntu/+source/nss-mdns/+bug/94940

> If so, then we (home users) need the reverse PTR.

Personally, I would prefer to see Ubuntu, and any other software
broken in similar ways, fixed.
-- 
Andreas Gustafsson, g...@araneus.fi

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