Difference between multiple NS and NS having multiple A

[Mark Andrews]

In message <CABUciRkAPvEyFr1s5ygu8=KfxDfLbJadauY4AsB4W_kWs5-tJQ at mail.gmail.com>
, Alexander Gurvitz writes:
> Is there any practical difference between the following two:
> 
> 1.
> example.com. NS ns1.example.com.
> example.com. NS ns2.example.com.
> ns1.example.com. A 1.1.1.1
> ns2.example.com. A 1.1.1.2
> 
> 2.
> example.com. NS ns.example.com.
> ns.example.com. A 1.1.1.1
> ns.example.com. A 1.1.1.2

Yes.  It makes fault isolation harder.
 
> Is there any possible difference in the resolvers behavior ?
> How bind9(10?) threats that ?
> 
> If someone knows about not-bind DNS resolvers I'd be happy to know that too.
> 
> Reason: We run a public DNS hosting. I think it would be more user-friendly
> if once we add more nameservers, we would just add them as A records under
> the same ns1/ns2, instead of advising each user to add ns3..nsX to their
> parent zones.

Add some AAAA address as well.

> Thanks,
> Alexander Gurvitz,
> net-me.net
> 
> --20cf3005141a4b8f6f04d5ec63b0
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> 
> <div dir=3D"ltr">Is there any practical difference between the following tw=
> o:<div><br></div><div>1.</div><div><a href=3D"http://example.com">example.c=
> om</a>. NS <a href=3D"http://ns1.example.com">ns1.example.com</a>.<br></div=
> ><div style>
> <div><div><a href=3D"http://example.com">example.com</a>. NS <a href=3D"htt=
> p://ns2.example.com">ns2.example.com</a>.</div></div><div style><div><a hre=
> f=3D"http://ns1.example.com">ns1.example.com</a>. A 1.1.1.1</div><div><div>=
> <a href=3D"http://ns2.example.com">ns2.example.com</a>. A 1.1.1.2</div>
> </div><div><br></div><div>2.=A0</div><div><div><a href=3D"http://example.co=
> m">example.com</a>. NS <a href=3D"http://ns.example.com">ns.example.com</a>=
> .<br></div><div><div><a href=3D"http://ns.example.com">ns.example.com</a>. =
> A 1.1.1.1<br>
> </div><div><div><a href=3D"http://ns.example.com">ns.example.com</a>. A 1.1=
> .1.2</div></div></div></div><div><br></div><div style>Is there any possible=
>  difference in the resolvers behavior ?</div><div style>How bind9(10?) thre=
> ats that ?</div>
> <div style><br></div><div style>If someone knows about not-bind DNS resolve=
> rs I'd be happy to know that too.</div><div style><br></div><div style>=
> Reason: We run a public DNS hosting. I think it would be more user-friendly=
>  if once we add more nameservers, we would just add them as A records under=
>  the same ns1/ns2, instead of advising each user to add ns3..nsX to their p=
> arent zones.</div>
> <div style><br></div><div style>Thanks,</div><div style>Alexander Gurvitz,<=
> /div><div style><a href=3D"http://net-me.net">net-me.net</a></div><div styl=
> e><br></div></div></div></div>
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org