[Samba] computer outside domain can access resource to inside

[syamsu.alam at showa.co.id]

Dear,

I have PDC Server running under Redhat 9 and use samba 2.2.7. It has running until now.

That I know, users cannot access resources in the network if they don't join to Domain. And, only administrator with root user+password can make users joined to Domain.

But, I have one problem.
There is one user, bring the private notebook. He create ip address (same with his office-computer), local account and password (same with his account in PDC) in his notebook.Then he un-plug LAN cable from his office-computer and plug-in to his private-notebook. And he can access share-file in other computer.

What's wrong ? Please help me.

Thanks,
SA