net ads keytab add succeeded but no SPN in AD (samba4.0.0beta8-GIT-5131359)

[Thomas Mueller]

Hi

i just tried to extract a keytab for nfs on an CentOS 6.2 (samba 3.5.10) 
from a samba4 (4.0.0beta8-GIT-5131359). 

wks#> net ads keytab add nfs/wks.dom.ain at DOM.AIN
Processing principals to add...
wks#> net ads keytab list | nfs
  3  DES cbc mode with CRC-32		 nfs/wks.dom.ain at DOM.AIN
  3  DES cbc mode with RSA-MD5		 nfs/wks.dom.ain at DOM.AIN
  3  ArcFour with HMAC/md5		 nfs/wks.dom.ain at DOM.AIN

so there are nfs principals stored on the wks keytab.

going to the server:

dc1#> ldbsearch \
    --url ldaps://dc1.dom.ain \
    -kyes  "servicePrincipalName=*" \
    servicePrincipalName | grep -i nfs
dc1#>

so there is no nfs principal in AD. Is this expected? has the SPN to be 
created with "samba-tool spn add" first, but if yes why does the "net ads 
keytab add" succeed?

- Thomas