North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: ttl for ns
On Thu, 12 Aug 2004, William Allen Simpson wrote: > I remain unenlightened. Should it be 2 days? Or 1 hour? And why the > inconsistent results? Obsolete root glue records? I think your first answer is from the .com gtlds which use a 2 day ttl, the second is from vix.com's nameservers which uses 1 hour ttl for all records. I dont know about best practice but I dont see any reason why your ns records should be any different from the rest of your zone for which use a value which suits you and your need to make changes (if these are your network a/ptrs something at least 24 hours would be fine). Having the NS records with explicitly smaller ttl wouldnt as i see it help as any change in nameservers as made with the registry would take the time of the registry plus the gtlds to become effective Steve > > A simple dig yields: > > ;; ANSWER SECTION: > vix.com. 2D IN NS ns-ext.vix.com. > vix.com. 2D IN NS ns1.gnac.com. > > ;; AUTHORITY SECTION: > vix.com. 2D IN NS ns1.gnac.com. > vix.com. 2D IN NS ns-ext.vix.com. > > > But a dig directly to the ns1.gnac.com or ns-ext.vix.com server yields: > > ;; ANSWER SECTION: > vix.com. 1H IN NS ns.lah1.vix.com. > vix.com. 1H IN NS ns.sql1.vix.com. > vix.com. 1H IN NS ns-ext.isc.org. > vix.com. 1H IN MX 10 sa.vix.com. > vix.com. 1H IN MX 20 fh.vix.com. > vix.com. 1H IN TXT "$Id: vix.com,v 1.190 2004/08/12 19:06:05 vixie Exp $" > vix.com. 1H IN A 204.152.188.231 > vix.com. 1H IN SOA ns.lah1.vix.com. hostmaster.vix.com. ( > 2004081201 ; serial > 1H ; refresh > 30M ; retry > 1W ; expiry > 1H ) ; minimum > > > ;; AUTHORITY SECTION: > vix.com. 1H IN NS ns.lah1.vix.com. > vix.com. 1H IN NS ns.sql1.vix.com. > vix.com. 1H IN NS ns-ext.isc.org. > > ;; ADDITIONAL SECTION: > ns.lah1.vix.com. 1H IN A 204.152.188.234 > ns.lah1.vix.com. 1H IN AAAA 2001:4f8:2::9 > ns.sql1.vix.com. 1H IN A 204.152.184.135 > ns.sql1.vix.com. 1H IN AAAA 2001:4f8:3::9 > ns-ext.isc.org. 1H IN AAAA 2001:4f8:0:2::13 > ns-ext.isc.org. 1H IN A 204.152.184.64 > sa.vix.com. 1H IN A 204.152.187.1 > sa.vix.com. 1H IN AAAA 2001:4f8:3:bb::1 > >
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