limit access to other LAN computers

[nsantos.pessoal () gmail com]

Hello,

 We have 2 Linux machines (CentOS) which are accessed from outside by one of our clients. The rest of our network is 
Windows machines.
 We do not use domains, for now. (small network)

 What is the best way to make those clients access only the machines they need to work and no other computer on the 
network?

 They have administrator rights on the Linux machines.

Thanks in advance,
Nuno Santos

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