[Samba] PDC and BDC problem

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Hello,

   The following is my PDC and BDC some setting: 

PDC: 

local master = yes 
os level = 65 
domain master = yes 
preferred master = yes 
domain logon = yes 

BDC: 

local master = no 
os level = 33 
domain master = no 
preferred master = no 
domain logon = yes 

 I has windows xp sp1(created in vmware + fc5(created in vmware)+Samba x2+
LDAP x2(Replication) for testing.

http://www.wilson-kwok.com/ldap.GIF

 I turned off BDC and PDC work find when user login, but I turned off PDC
and user cannot login to BDC, can someone tell me what is the problem ?

Thanks


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