Isolating a computer in the network

Posted by Karma Soone on Server Fault See other posts from Server Fault or by Karma Soone
Published on 2009-07-01T19:43:00Z Indexed on 2010/06/11 18:23 UTC
Read the original article Hit count: 258

Filed under:

networking

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security

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firewall

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router

I've got a small network and want to isolate one of the computers from the whole network.

My Network:

                               <----> Trusted PC 1
ADSL Router --> Netgear dg834g <----> Trusted PC 2
                               <----> Untrusted PC

I want to isolate this untrusted PC in the network.

That means the network should be secure against : * ARP Poisoning * Sniffing * Untrusted PC should not see / reach any other computers within the network but can go out the internet.

Static DHCP and switch usage solves the problem of sniffing/ARP poisoning.
I can enable IPSec between computers but the real problem is sniffing the traffic between the router and one of the trusted computers.
Against getting a new IP address (second IP address from the same computer) I need a firewall with port security (I think) or I don't think my ADSL router supports that.

To summarise I'm looking for a hardware firewall/router which can isolate one port from the rest of the network. Could you recommend such a hardware or can I easily accomplish that with my current network?

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