Samba4 AD safe for delegation

[David Feurle]

Hi,

I have a setup with a Samba4 AD server. I can sucessfully I can login 
with putty via ssh to my linux servers.
The only thing that is missing is that my kerberos ticket is not 
delegated (klist shows no tickets).

I found this 
link(http://newsgroups.derkeiler.com/Archive/Comp/comp.protocols.kerberos/2010-12/msg00017.html) 
that states that I need to mark the domain as trusted for delegation via 
setting a dns entry.
How exactly does this entry look like? How can this be set in samba4 dns?

Thanks!

David