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Virus protection on guest laptops

Posted on 2014-11-23
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Last Modified: 2014-12-03
We have antivirus on our computers on our LAN.  However, we have guest laptops that connect to our network.  Is there any way to protect our network from infected laptops that hook up to our guest internet?
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Question by:al4629740
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Expert Comment

by:andreas
ID: 40461450
You might not allow thr guest Laptops to ANY Lan port of your network. I would suggest to set up a seperate LAN for the laptops and marking the LAN ports in the rooms accordingly.

This Laptop-LAN needs to be seperated by firewall rules from your work-LAN. Best is to only allow internet for the guest-LAN via Proxies for the protocols needed.

If you connect the laptops into your current  LAN its not possible to protect you from all issues the laptops might bring.
1. There might be new malware NO AV-scanner is able to detect now.
2. The laptops might try to divert traffic via arp-spoofing to perform man in the middle attacks.
3. The laptops might run own DHCP and DNS -servers to distribute false network configs, could be used for man in the middle too.
4. Laptops might start to brute force account passwords. In coorportate LANs the PCs usually trust the other PCs in the same lan and the windows firewall wont block login attempts.
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by:al4629740
ID: 40462016
What about putting them behind another separate router?
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by:andreas
ID: 40462933
Would be possible IF the 2nd router blocks access to the IPs in the 1st subnet that is located on its WAN side. just route packets out and in to the internet but block the access to the subnet that your first router has as the LAN.
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Author Comment

by:al4629740
ID: 40464685
Yes.  If that is the case, would that secure against most threats?
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andreas earned 500 total points
ID: 40465211
it would offer a good level of protection. But if you install proxy servers, as I suggested in my first post(that proxy only the protocols you want to allow for guests) the protection would be much more high.

Mark there is no 100% secure system. Holes might always be there (e.g. in the 2nd router you want to put) and thus the internal network can again attack your work environment.
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