Cache lag on NS change for 5 days ??

[Mark_Andrews at isc.org]

> The nameservers on micouriers.co.uk were changed to a new hosting
> service recently (according to nominet.org.uk on July 31st).
> 
> With my ISP (telewest.co.uk) the change was finally apparent Sunday
> 3rd August. The broadband ISP that the micouriers people use, FirstNet
> (http://www.firstnet.net.uk/), has apparently still got stale data in
> their cache, and so in the office they can't see the site or receive
> email from the pop subdomain.
> 
> A tracert micouriers.co.uk on their office computers won't resolve.
> 
> I can 'fix' this on Win clients with the Hosts file, but I want to
> track down what's wrong (the support people at firstnet are no help).
> 
> Surely a 1 day TTL (nslookup with server ns2.gradwell.net) shouldn't
> lead to 5 day old data? Do the records for the domain look ok?

	Ensure that the *old* servers have the *new* zone content or
	are not serving the zone.

	Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org