Re: L-Root address change [Re: [DNSOP] AS112 for TLDs]

At Wed, 28 Nov 2007 10:55:44 +0100,
Peter Koch <pk@DENIC.DE> wrote:

> > Currently about 60% New IP to 40% old IP... and rising slowly
> > 
> > So clearly a lot of folks still need to up date their hints files :(
> 
> part of that traffic will be due to old hints files, but priming was
> actually supposed to accelerate the migration.  40% of total L traffic
> seems a bit much for 1/13 of the priming traffic?

BIND9 also uses the root hint when it finds necessary glue is
missing.  For example, consider the following delegation:

child.foo.example.  NS 86400 ns.child.foo.example.
ns.child.foo.example. A 3600 192.0.2.1

When the (recursive) resolver first visits the child.foo.example zone,
it caches both the NS and A records.  The glue (A) record will expire
in 1 hour.  When the resolver tries to visit the zone after that while
still keeping the NS record, it tries to fetch the missing glue from
the root using the hint file, regardless of whether it has the root NS
and the root server addresses in its cache.

This would be another reason for the queries to the old L-root
address, though I don't think it makes the 40% of total traffic unless
the vast majority of hint files aren't updated.

					JINMEI, Tatuya
					Communication Platform Lab.
					Corporate R&D Center, Toshiba Corp.
					jinmei@isl.rdc.toshiba.co.jp

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