"Stephen J. Wilcox" wrote:
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.
That's a possibility, but when I checked @a.gtld-servers.net, ;; ANSWER SECTION: vix.net. 2D IN NS ns1.pingmagic.com. vix.net. 2D IN NS ns2.pingmagic.com. ;; AUTHORITY SECTION: vix.net. 2D IN NS ns1.pingmagic.com. vix.net. 2D IN NS ns2.pingmagic.com. ;; ADDITIONAL SECTION: ns1.pingmagic.com. 2D IN A 202.140.169.216 ns2.pingmagic.com. 2D IN A 143.89.51.48 So, A: 2 days ?, recursed: 2 days, 2nd set of servers direct: 1 hour, 3rd set of servers
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).
But that's the "thinking locally, acting globally" we're talking about in the earlier thread.
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
Yes, and the registries would seem to be using 2 days. However, for our domain(s) we get the same servers @a, just with longer NS times.
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 -- William Allen Simpson Key fingerprint = 17 40 5E 67 15 6F 31 26 DD 0D B9 9B 6A 15 2C 32