Problems with root on network clients

[Alex Pires de Camargo]

        Hi!
        I administer a network with server and clients Debian based,
and would like to know if I can solve this problem.
        It's a little easy to an user open a PC, damage the batteries,
boot with floppy and login as root in a client. But one thing is
undesirable. He can do su - <users> and do many things on users
homes. The rootsquash options on nfs solve the problem when the
user is root, but as I explain, this is not sufficient.
        Is there anything I'm forgetting to make? On server I run
potato, nis (not nis+), nfs-kernel-server.
        Thanks,

                                Alex.


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