Forwarding DNS requests for realm to forward server

[Adda Rathbone]

Hello everyone,
I hope this is the right list to post this. During the last months I played
with Samba4 as Active Directory Domain Controller in my home network
(windows
and linux machines), to create a single password environment. During testing
however I realized, that I could not integrate samba as planed.

Requirements:
- (re-)use dhcp and dns of my router (domain: example.com)
- use samba to authenticate logon on most (but not all) machines using the
  realm example.com

Problems:
After changing the dhcp server on my router to use the samba server as DNS I
was not able to ping the linux machines that had not joined the AD. The
samba
server was configured to forward dns requests to the router.
Of course the internal DNS of the router could resolve the requests (tested
via
host command).

Example:
$ ping linux01.example.com
ping: unknown host ...

$ ping windows01.example.com
64 bytes from ...

$ host linux01.example.com samba
...
Host linux01.example.com not found: 3(NXDOMAIN)

$ host linux01.example.com router
...
linux01 has address 192.168.0.100


Solution:
It would be nice if the samba server could be configured to forward dns
requests (of its domain) that could not be resolved (NXDOMAIN) by the
internal
server to the forward dns server.

This would allow for an easy setup of samba as AD DC in small businesses or
home networks, without changing too much of the existing infrastructure.
Only the dhcp server settings needs to be adjusted to use the samba server
as
DNS server.

I would like to hear feedback if this change is sensible.

Thank you for your time
Adda