On Mon, May 09, 2011 at 02:24:05PM +0100, Chris Russell wrote:
>  Firstly,  when using an external server as a recursor; can this be an IPv6 
> host ?   I have the auth server forwarding  to bind for any recursive 
> queries, this works when I specify the bind IPv4 address, but not the IPv6 
> address. Both queries work fine if querying bind from the pdns server 
> directly using dig on ipv4 or ipv6.

As of 2191 (now building) this can be IPv6 too. Odd that we missed it!

>  Secondly, when using powerdns secure-zone and the gmysql backend, I`m
> guessing rectify-zone must be ran whenever any records are created to
> resign the zone.  This being the case, does this lead to having a hidden
> master (ie: non publicly accessable) host or db in order to be slightly
> more secure [making the running of the signing process hidden] ?

There is no need to run rectify zone each time, as long as 'auth' and
'ordername' are filled out correctly. 

This is detailed in
http://doc.powerdns.com/dnssec-modes.html#dnssec-direct-database

A hidden master is indeed more secure since it separates the server from the 
keying material.

>  Finally, Is there any documentation of the validity length of the keys,
> or do these rollover automatically ?

The keys remain where they are, unless you roll them over.
http://doc.powerdns.com/powerdnssec.html explains the idea behind this,
where you have 'active' and 'passive' keys. 

http://doc.powerdns.com/dnssec-operational-doctrine.html#zsk-rollover also
has some sample command lines.

It appears there is very little benefit to automated key rollovers (unlike
say automated signature rollovers, which are very necessary).

>  Bert as you thought, this build this resolves the issue I had with mysql
> going away and the server taking a while to reconnect.  Its serving
> records from the cache just fine.

Great to hear!

        Bert
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