IPv6 PTR Records

Maechler Philippe pmaechler-ml at glattnet.ch
Mon Mar 10 15:28:07 UTC 2014

Hello bind-users
How do you manage your IPv6 Reverse Entries?
Let´s assume that we have a /32 IPv6 subnet for our needs and that we only publish PTR records where they are needed like for mail servers and maybe DNS and web servers. 
Our Network is: 2001:db8::/32
This would give us a Zone named 8.b.d.
Our DNS has the ip 2001:db8:193:192::20/64 and the other one has 2001:db8:193:193::20/64
1) Would you create an entry in 8.b.d. like:      IN A  dns1.example.org.      IN A  dns2.example.org.
Or (also in 8.b.d.
dns1        IN    A     dns1.example.org.
dns2        IN    A     dns2.example.org.
Or... the third aproach is the complex one:
In the Zone 8.b.d.
delegate 0.8.b.d. to dns1.example.org
In the Zone 0.8.b.d.
delegate 1.0.8.b.d. to dns1.example.org
In the Zone 1.0.8.b.d.
delegate to dns1.example.org
and so on until we reach There I create an entry like
20          IN    A     dns1.example.org.
2) In the near future we will have a lot more entries in the reverse Zone and, so I guess, some parts of it will be delegated to other servers. When would you start delegating parts of Zone 8.b.d. into other Zone-Files?
How far down the tree would you go for de delegation?
3) Will a recursive resolver have problems if I only have a SOA for 8.b.d. and no SOA for the zones below like
The reason I ask is:
We had generic A records for our IPv4 space: dynamic.001-002.003-004.catv.example.org IN A and some mailservers complained that there was no zone for 001-002.003-004.catv.example.org. nor 003-0004.catv.example.org. and no entry for catv.example.org. (we only had the example.org Zone with host a host dynamic.001-002.003-004.catv)
Tia for your inputs and tips

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