Multiple NSs or multiple glue records

[Peter Dambier]

For diversity both additional AAAA and additional A records are not a good idea.

If server.aaaa does not answer because I do not have IPv6 routing, my resolver
shall never query server.a1 because it thinks server.* is dead.

Same if server.a1 does not answer because my route works only on a2 it shall
not even try to reach server.a2

Even if server.a1 and server.a2 are one and the same server I should offer
them an extra NS until I have some 5 to 13 NS records. With IPv6 or DNSSEC
it might be enough to have some 8 servers. Then you may think about adding
A or AAAA records to existing servers.

It is not the quality of your network that is important. Think of somebody
in Antartica on a shortwave link and heavy thunderstorms. He might succeed
on the fifth try to your nameservers. That is what I have seen Zimbabwe
right now. Their nameservers are still working.

Kind regards
Peter and Karin



Gustavo Lozano wrote:
> I think that sometime ago I read a post about what is better multiple 
> NS or multiple A for the same NS. Some of my colleagues and I are 
> having a discussion of what are the pros and cons of the following 
> cases and maybe someone in this list can contribute to our discussion.
> 
> Case 1.
> example.com.   IN        NS       a.example.com.
> example.com.   IN        NS       b.example.com.
> example.com.   IN        NS       c.example.com.
> a.example.com IN        A         10.1.1.1
> b.example.com IN        A         10.2.1.1
> c.example.com IN        A         10.3.1.1
> 
> Case 2.
> example.com.   IN        NS       a.example.com.
> a.example.com IN        A         10.1.1.1
> a.example.com IN        A         10.2.1.1
> a.example.com IN        A         10.3.1.1
> 
> Thank you.
> 
> 
> Gustavo Lozano 
> 
> 


-- 
Peter and Karin Dambier
Cesidian Root - Radice Cesidiana
Graeffstrasse 14
D-64646 Heppenheim
+49(6252)671-788 (Telekom)
+49(179)108-3978 (O2 Genion)
+49(6252)750-308 (VoIP: sipgate.de)
mail: peter at peter-dambier.de
mail: peter at echnaton.serveftp.com
http://iason.site.voila.fr/
https://sourceforge.net/projects/iason/