[73118] in North American Network Operators' Group
Re: ttl for ns
daemon@ATHENA.MIT.EDU (Stephen J. Wilcox)
Fri Aug 13 03:10:58 2004
Date: Fri, 13 Aug 2004 08:10:20 +0100 (BST)
From: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
To: William Allen Simpson <wsimpson@greendragon.com>
Cc: nanog@merit.edu
In-Reply-To: <411C3352.A8F68E6A@greendragon.com>
Errors-To: owner-nanog-outgoing@merit.edu
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
>
>
