[Samba] DNS troubles while manual upgrading Samba3 to Samba4?

[Воронин К.В.]

Hi, guys.

I have DC on Samba 3.6. working for years so far.
Now it`s time to go forward, as it can`t provide enough security and 
flexibility.
But reading Wiki on classicupgrade I see that there could be hell of 
problems, and anyway I`m bit scared of doing that at once. Even though I 
have more than 200 boxes I`d rather prefer to set up
Samba 4 AD DC on separate server, set up new domain and then step by 
step, department by department join boxes to the new domain. (does it 
sound too crazy?)

But there is a major problem with DNS as I can see it: I`ll have to set 
up my new DC as a DNS server
for my new domain. But I have DHCP + dynDNS now, so let`s presume that 
during this period when I have 2 domains
one box in new domain gets an address from DHCP server, which DNS it 
should say "I`m XXX" to? It seems that I`ll have to have boxes with
two different names (pc.domain1 / pc.domain2) but it`s impossible.
Is there a/the step-by-step solution? Or is it the only one - just to 
jump into classicupgrade?

yours truly,

Konstantin.