Re: root and in-addr.arpa zone transfers

2009-09-12 Thread Michael Monnerie
On Freitag 11 September 2009 Matus UHLAR - fantomas wrote:
> - it's quite useless to cache the .arpa and .in-addr.arpa since
> unlike other TLD's they are hierarchically organised so there won't
> be any valuable benefit from slaving them, only risks (see above).

Every other point is OK, but I don't understand this one. They are all 
hierarchical, what's the difference with .in-addr.arpa?

mfg zmi
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Re: root and in-addr.arpa zone transfers

2009-09-12 Thread Matus UHLAR - fantomas
> On Freitag 11 September 2009 Matus UHLAR - fantomas wrote:
> > - it's quite useless to cache the .arpa and .in-addr.arpa since
> > unlike other TLD's they are hierarchically organised so there won't
> > be any valuable benefit from slaving them, only risks (see above).

On 12.09.09 09:27, Michael Monnerie wrote:
> Every other point is OK, but I don't understand this one. They are all 
> hierarchical, what's the difference with .in-addr.arpa?

while there are many manual mistypes in root and other domains, there are 
(nearly) no
mistypes in .arpa and in-addr.arpa domains since these domains are
accessed by software and miskates here are unlikely to happen 
(of course sw can have bugs but authors would soon notice it doesn't work).

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Re: root and in-addr.arpa zone transfers

2009-09-12 Thread Mark Andrews

In message <20090912082415.ga13...@fantomas.sk>, Matus UHLAR - fantomas writes:
> > On Freitag 11 September 2009 Matus UHLAR - fantomas wrote:
> > > - it's quite useless to cache the .arpa and .in-addr.arpa since
> > > unlike other TLD's they are hierarchically organised so there won't
> > > be any valuable benefit from slaving them, only risks (see above).
> 
> On 12.09.09 09:27, Michael Monnerie wrote:
> > Every other point is OK, but I don't understand this one. They are all 
> > hierarchical, what's the difference with .in-addr.arpa?
> 
> while there are many manual mistypes in root and other domains, there are (ne
> arly) no
> mistypes in .arpa and in-addr.arpa domains since these domains are
> accessed by software and miskates here are unlikely to happen 
> (of course sw can have bugs but authors would soon notice it doesn't work).

Whether in-addr.arpa is useful or not depends on where you are in
the world and what the connectivity is like.  There was a time when
I would have recommended slaving the root and in-addr.arpa to every
Australian site.  When the one link connecting most of Australia
went down this sort of think kept a vast majority of the internal
communications within Australia working as you could find "au" and
you could do reverse lookups of the Australian address blocks.

Mark
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PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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