Multiple servers for the same zone

[Stephen Carville]

I do not even know if this is possible but...

I am instituting DHCP with Dynamic DNS for my employer.  Because this
will eventually be a world wide system, the decision was made to put
DHCP served addresses in sub domains under our corporate domain. 
Servers, network devices, and any machines that will have to keep
fixed addresses will remain in the second level domain.

The forward lookups work just fine.  If I request the address for
foo.bar.com the zone master for bar.com responds with an address.  If
I request an address for foo.dhcp.bar.com, the zone master for
dhcp.bar.com responds.  Slick and flawless.

It is the reverse DNS queries that are killing me.  Some nodes on any
particular in-addr.arpa zone will be in bar.com and other nodes will
be in dhcp.bar.com and I cannot figure out a clean way to resolve
both.  If I request a reverse DNS on an address 192.168.10.250 that is
served by the master server for bar.com, no problem.  If I request
192.168.10.11 that is handled by the master for dhcp.bar.com I cannot
get a reverse DNS unless I specify the server for dhcp.bar.com in the
searchlist.  This will not work for a reverse DNS being made by any
arbitrary node outside the corporate network.

I have DHCP working and talking to DNS.  Everybody (mostly laptop
users) who has used it loves it and doesn't even know about this
problem.  Sooner or later tho, it is going to bite me in the arse and
it the only thing holding me back from a full scale rollout. 

Any ideas?  Is it possible to split responsibility for an in-addr.arpa
zone between two zone masters

-- 
Stephen Carville
carville at cpl.net
----------------------------------------------------
There are two kinds of people: those who do the work and those
who take the credit. Try to be in the first group; there is less      
competition there. 
                                        Indira Gandhi