[Samba] smbclient -k works; mount -t cifs does not

[Mike Leone]

I am confused (nothing new there ...). I have 2 Ubuntu 9.10 Samba
servers. I am trying to mount a share from the other (i.e., "workhorse"
is trying to mount a share on "dual-booter"). If I specify a smbmount
command with a -k option, I can mount the share:

turgon at workhorse:~$ klist
Ticket cache: FILE:/tmp/krb5cc_1000
Default principal: turgon at DACRIB.LOCAL

Valid starting     Expires            Service principal
05/03/10 18:55:31  05/04/10 04:55:31  krbtgt/DACRIB.LOCAL at DACRIB.LOCAL
	renew until 05/09/10 22:56:03
05/03/10 23:07:07  05/04/10 04:55:31
cifs/dual-booter.dacrib.local at DACRIB.LOCAL
	renew until 05/09/10 22:56:03


turgon at workhorse:~$ smbclient //dual-booter/TestShare /mnt -k
Domain=[DACRIB] OS=[Unix] Server=[Samba 3.4.0]
smb: \> ls
  .                              D        0  Sat May  1 19:27:48 2010
  ..                             D        0  Mon May  3 19:58:00 2010
  TestFile                                0  Sat May  1 19:27:48 2010

		37555 blocks of size 524288. 22379 blocks available

However, I can't seem to mount it using mount -t cifs:

$ sudo mount -t cifs //dual-booter/TestShare /mnt -o username=DACRIB+turgon
[sudo] password for turgon:
Password:
mount error(13): Permission denied
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

What I'd like to do is to set this in /etc/fstab. But there seems to be
no way to use Kerberos to authenticate the mounting, and it's only
Kerberos (and smbmount) that seems to work. And using the "-o sec=krb5"
options on mount doesn't seem to work, either.

$ sudo mount -t cifs //dual-booter/TestShare /mnt -o sec=krb5
mount error(2): No such file or directory
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

Anyone? I really don't want to have to make a script that uses smbmount
-k, running on login, rather than in /etc/fstab.

Thanks