Demon internet in the UK used to change the TTL's of everything to 14 days otherwise their DNS servers would fall over... but that was in the late 90's. I would hope they no longer do that. Cheers, Bill From: Stuart MacIntosh [mailto:Stuart.MacIntosh(a)ngaitahu.iwi.nz] Sent: Wednesday, 12 November 2008 4:22 p.m. To: nznog(a)list.waikato.ac.nz Subject: [nznog] DNS TTL Hello NZNOG Quick question, hopefully. How common is it for DNS server admins to manipulate TTLs of NS records, on their recursive/customer-facing servers? Also, when seeing a reply from a caching server (query A-type) NS is returned correctly but not the A record. Why is this (typically)? Stuart MacIntosh ________________________________ This e-mail message has been scanned for Viruses and Content and cleared by MailMarshal ________________________________ No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.4/1753 - Release Date: 11/11/2008 8:59 a.m.