[dns-operations] best way to reprime root-hints?

[Mark Andrews]

> Hi people,
> 
> While fixing some bugs in PowerDNS, I noticed a.root-servers.net no longer
> returns all IP addresses of all root-servers (it gets as far as J). This may
> have been the case for a long time. Instead we now have some AAAA records,
> which is good.
> 
> However, it used to be possible to refresh the root with a single query.

	It still is.

> I'm
> pondering what is best these days, iterating over all NS records returned to
> get their IP addresses, quering for each of them in turn?

	Neither, use queries that will return the full answer set.

	dig ns . +bufsize=1200 @a.root-servers.net
		or
	dig ns . +vc @a.root-servers.net

	The later only if your dig is so ancient that it doesn't
	support +bufsize or if you have a misconfigured filewall
	that you can't fix.

> The problem is that otherwise in quite a number of cases, outdated
> information will remain in cache otherwise, in this case l.root-servers.net.
> 
> Ideas?

	Use EDNS.
 
> 	Bert
> 
> 
> -- 
> http://www.PowerDNS.com      Open source, database driven DNS Software 
> http://netherlabs.nl              Open and Closed source services
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org