Last informations about this too long post. After that i will renounce...

some log information taken from NAS
crond 2.3.2 dillon, started, log level 8
^MStarting pid 1785, console /dev/console: '/sbin/getty'
samba working on NAS
smbd version 3.0.25a started.
disable NFS in NAS web-interface
NFS: NFS Server disabled OK
try to smbmount from ASUS
[admin@hd asus root]$ smbmount //192.168.1.168/public /mnt/protected/NAS
INFO: Debug class all level = 1 (pid 15345 from pid 15345)
Password:
Anonymous login successful
cannot mount on /mnt/protected/NAS: Stale NFS file handle
smbmnt failed: 1
and this is log from NAS
hd asus (192.168.1.1) connect to service public initially as user guest-share (uid=7002, gid=7001) (pid 1992)
hd asus (192.168.1.1) closed connection to service public