On 7/2/07, Noah Meyerhans <[EMAIL PROTECTED]> wrote:
On Mon, Jul 02, 2007 at 12:08:33PM +0200, Olaf van der Spek wrote:
> I've no idea what causes it, but the reverse DNS name is alternating
> between an old (d224.x-mailer.de) and a new name (e.xwis.net).
It's unlikely that this is ping's fault. Most likely one of your
nameservers has stale data cached, and it's sometimes returning answers
quicker than another nameserver, which has newer data cached.
Yes, I thought about this later. I assumed either ping or the OS
itself would cache DNS queries, but I guess this doesn't happen.
The issue went away pretty soon.
You should be able to check this using "host <ip> <nameserver>", where
ip is the IP address you're resolving, and server is one of the IP
addresses in /etc/resolv.conf. Do this for each nameserver, and you'll
likely find that one of them returns stale data.
noah
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