I am systems administrator in a high school who is jumping on the linux band wagon. I have three NT networks in my school address ranges 192.168.100.x, 192.168.101.x and 10.10.x.x. I intend to use linux to act as a router and firewall between these networks. The two 192.x.x.x networks need to be able to ping each other (for e-mail) and i would like for selected machines on these networks to be able to access the 10.10.x.x network (this is our administration network) and the 10.10.x.x network needs to be able to access the 192.x.x.x networks for internet access. I am currently installing red hat 6.1 on my machine and have successfuly set up routing between two networks (much better than microsoft) but I am unsure how to deny access to some machines. Any help would be appreciated.
Also when I set it up I set up the GUI as well and this starts automatically. Is there any way of stopping this.
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