log Inside LAN

[nsantos.pessoal () gmail com]

Hello people,

 In our network we have mainly Windows Machines, but we have too 2 Linux (CentOS) machines used for a vpn connection 
with one of our clients. Since they connect to us through VPN they can 'see' all of our network. By the way, we're not 
using domains (network too small) and they must connect to the linux machines with admin privileges.

 I would like to know if i can install some kind of loggin application on the Linux machine to see if they're accessing 
resources on our LAN that they shouldn't. 

 I tried iptraff already, but i would like to know some alternatives? preferably one that consumes very little resource 
since it is a production machine.

Thanks in advance,
Nuno Santos

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