[Samba] Realms: subdom or not subdom ?

[Martinx - ジェームズ]

Guys,

Currently, I'm running the following configuration (@ lab, according to the
recommendation for the Realm from Samba_AD_DC_HOWTO):

---
AD DC Hostname:                    samba-ad-1

AD DNS Domain Name:                samdom.example.com

Kerberos Realm:                    SAMDOM.EXAMPLE.COM

NT4 Domain Name/NetBIOS Name:      samdom

IP Address:                        192.168.1.1

Server Role:                       Domain Controller (DC)

Domain Admin Password:             pa$$w0rd

Forwarder DNS Server:              192.168.1.254
---

But then, all my computers (servers and desktops), are being registered
within "*.samdom.example.com", and I was expecting to see those machines at
"*.example.com"...

So, it is possible to use a recommended realm, like "SAMDOM.EXAMPLE.COM"
just for the realm itself, while at the same time, registering the machines
at *.example.com" ?

If yes, can someone point a quick and dirty guide to do that?!

Thanks!
Thiago