nanog mailing list archives
Re: ttl for ns
From: "Stephen J. Wilcox" <steve () telecomplete co uk>
Date: Fri, 13 Aug 2004 08:10:20 +0100 (BST)
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
Current thread:
- Re: That MIT paper, (continued)
- Re: That MIT paper Paul Vixie (Aug 11)
- Re: That MIT paper David G. Andersen (Aug 11)
- Re: That MIT paper Randy Bush (Aug 11)
- Re: That MIT paper Niels Bakker (Aug 12)
- Re: That MIT paper David G. Andersen (Aug 12)
- Re: That MIT paper Paul Vixie (Aug 12)
- Re: That MIT paper Randy Bush (Aug 12)
- Re: That MIT paper David G. Andersen (Aug 11)
- Re: That MIT paper Paul Vixie (Aug 11)
- Re: That MIT paper William Allen Simpson (Aug 12)
- ttl for ns William Allen Simpson (Aug 12)
- Re: ttl for ns Stephen J. Wilcox (Aug 13)
- Re: ttl for ns William Allen Simpson (Aug 13)
- Re: ttl for ns William Allen Simpson (Aug 13)
- Re: ttl for ns John Payne (Aug 13)
- Re: ttl for ns William Allen Simpson (Aug 13)