Intermittent incorrect DNS resolution?

William Herrin bill at
Wed Jan 16 22:34:38 UTC 2013

On Wed, Jan 16, 2013 at 5:00 PM, Erik Levinson
<erik.levinson at> wrote:
> I suspect that somewhere, one of their servers has the wrong data, or
> some resolver is misbehaving, but based on the
> pattern/traffic/volume/randomization of hostnames, the resolver theory is
> less likely. I haven't analyzed the source IPs yet to see if they're in a
> particular set of countries.

Hi Erik,

Look up "DNS pinning." I can't rule out the possibility of a faulty
DNS server but it's far more likely your customers' web browsers are
simply ignoring the DNS TTL. Malfunctioning as designed. If you keep
it live, you'll notice a falling trickle of traffic to the old address
for the next year or so.

Bill Herrin

William D. Herrin ................ herrin at  bill at
3005 Crane Dr. ...................... Web: <>
Falls Church, VA 22042-3004

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