config samba to authenticate users frm AD

[needee]

Dear All
OS: Suse 10
samba: samba-3.0.22-13.16

I have to configure the samba server, as a file server for windows xp client computers, in a MS Active Directory based network.
All the users have account in Active Directory(the Domain Controller is Windows 2003 server).
Now plz help me how to config the samba, so that when a network user(AD user), access the files/folders on the file server(samba), Samba Server authenticates the user frm Active Directory.

Plz help
Regards

[needee]

domain controller fqdn is : srv254.mydomainname.com.local
srv254.mydomainname.com.local IP: 192.168.1.102
samba server hostname is: fs1

Ok I have done the following

1, add in /etc/hosts
srv254.mydomainname.com.local 192.168.1.102

2, add the following lines in smb.conf
workgroup = mydomainname
realm = MYDOMAINNAME.COM.LOCAL
security = ADS
encrypt passwords = yes
password server = srv254.mydomainname.com.local
.
.
.
[data]
path = /mnt
read only = no
create mask = 0664

3, create a computer account on Domain Controller

4, then on samba server, ran the following commands
#net RPC JOIN -U administrator%adminpasswd
Joined domain MYDOMAINNAME.
# net ADS JOIN -S srv254.mydomainname.com.local -U administrator
administator's password:
[2007/02/28 14:38:45, 0] libads/kerberos.c:ads_kinit_password(206)
kerberos_kinit_password administator@MYDOMAINNAME.COM.LOCAL failed: Cannot resolve network address for KDC in requested realm
[2007/02/28 14:38:45, 0] utils/net_ads.c:ads_startup(193)
ads_connect: Cannot resolve network address for KDC in requested realm

5, Even the above eror I start samba
#rcsmb start (samb starts successfuly)

6, on a windows XP machine, I logged on the domain with the admin account, then
start > run > \\fs1\data
samba server ask for User Name, and password
i provide the admin userid, and password ... but no success.

Please help me
Regards
needee