[Samba] question : dns.keytab and named.conf.update

[L.P.H. van Belle]

Hai, 
 
Just a question .
Why are the Principals in the dns.keytab   different from what is in the named.conf.update file. 
 

ktutil:  rkt /var/lib/samba/private/dns.keytab
ktutil:  list
slot KVNO Principal
---- ---- ---------------------------------------------------------------------
   1    1 DNS/rtd-dc1.INTERNAL.DOMAIN.TLD at INTERNAL.DOMAIN.TLD
   2    1          dns-rtd-dc1 at INTERNAL.DOMAIN.TLD
 
   
   
cat /var/lib/samba/private/named.conf.update 
 

   update-policy {
        grant INTERNAL.DOMAIN.TLD ms-self * A AAAA;
        grant Administrator at INTERNAL.DOMAIN.TLD wildcard * A AAAA SRV CNAME;
        grant RTD-DC1$@INTERNAL.DOMAIN.TLD wildcard * A AAAA SRV CNAME;
};
 
   
   
   in reverse 
  
          update-policy {
                grant *.DOMAIN.TLD wildcard *.123.168.192.in-addr.arpa. PTR;
        };
 
 
 
I would expect too see in the dns.keytab also 
         RTD-DC1$@INTERNAL.DOMAIN.TLD

But its not there any reason for this of am i missing something. 
( this is not my expertise, but any insight in this would be nice. ) 
 
Thank! 
 
Louis