Dynamic DNS & SDB

[ms419 at freezone.co.uk]

Our organization stores static DNS information in LDAP, & uses Stig 
Venaas' LDAP SDB backend. Thank you Stig!

We would also like to use dynamic DNS updates, but this doesn't seem to 
work; we're using BIND 9.2.4:

ourhost:~> nsupdate
 > update add newhost.ourdomain 86400 A 172.16.1.1
 >
update failed: SERVFAIL
 >

While we could create a separate subdomain for dynamic DNS, our reverse 
zones are all in LDAP, so we can't dynamically update reverse lookup 
information, which is essential.

I am prepared to do a bit O' coding to make this work, but the problem 
seems to be the SDB backend doesn't support dynamic updates (as of 
9.2.4).

It isn't necessary that dynamic updates be actually propagated to the 
LDAP database (kewl as that would be); we are satisfied to store 
dynamic updates transiently in memory.

Is anyone familiar with:

1 ) using SDB & dynamic DNS updates together?
2 ) using a dynamically updatable database in front of an SDB database?
3 ) another DNS server, supporting dynamic DNS updates & LDAP, or SQL?

Thank you!

Jack