Network setup question

privateBeavis · 07-01-2015 1:07pm #1

Hi,

I have a question regarding network setup/configuration. We had some issues recently with viruses/malware and need to better protect our network.

We do some development/testing of video servers so there are a number of windows based NVR's on our office network. Most of them we can't install anti-virus on and some have no firewall so leaves them quite open to infection.

What I would like to setup is where the machines in question have no access to the internet but we still need to be able to connect to those machines from our office LAN (and from externally via our office LAN VPN)

My idea is to create a separate private network with all the NVR's on it and buy a cheap hardware firewall (e.g. NETGEAR ProSafe VPN Firewall) and connect that to either our office LAN or direct to WAN)
Would it just be a case of configuration to restrict all access then only to the known IP:ports of the individual NVR's?

Or is there a different/better way to secure the network.

(Note: currently we have a basic D-Link router as our access point to WAN)

Egginacup · 07-01-2015 1:22pm

privateBeavis wrote: »

Hi,

I have a question regarding network setup/configuration. We had some issues recently with viruses/malware and need to better protect our network.

We do some development/testing of video servers so there are a number of windows based NVR's on our office network. Most of them we can't install anti-virus on and some have no firewall so leaves them quite open to infection.

What I would like to setup is where the machines in question have no access to the internet but we still need to be able to connect to those machines from our office LAN (and from externally via our office LAN VPN)

My idea is to create a separate private network with all the NVR's on it and buy a cheap hardware firewall (e.g. NETGEAR ProSafe VPN Firewall) and connect that to either our office LAN or direct to WAN)
Would it just be a case of configuration to restrict all access then only to the known IP:ports of the individual NVR's?

Or is there a different/better way to secure the network.

(Note: currently we have a basic D-Link router as our access point to WAN)

As long as the servers are accessible from the outside OR someone using the server can access the outside (hit websites, download and install shareware, etc) then there is a possibility of infection.

ObeyTheSuit · 08-01-2015 6:08am

I could go to town on this thread but you've said you can't modify the OS?
May I ask why you can't put an AV or enable the software firewall on the NVR's? Not that AV is even half decent against a threat from the wild. Symantec admitted that it only caught 40% of zero day threats anyway. It's just another thing to help reduce the threat.

VLAN would be a good start Start by locking down the ports for everything bar what you need (remote access, streaming, FTP etc).
Create ACL's so they can be accessed by the admin workstation subnet only. Only required ports in, required ports out.
Block the Gateway from external network access or to the VLAN\subnet(s) you require

The network side of things will help contain a virus but I would recommend you also look at hardening the OS preventing it from even infecting the machine. Most NVR's I've come across old XP Operating systems and are non-domain joined. I can help you with hardening the OS that if it's an option and perhaps creating an image you can use as a standard deployment.