The first and obvious question is why and who ill require the network sever appliance? The answer is really very simple. It is the small businesses that require the network server appliance. The big businesses have large requirements for the network server power. Their web sites can get millions of visitors per day. The small business web site is visited by a few thousand visitors. The small business organizations do not require very high server power. The costs are prohibitive. The small business organizations require network server appliance for their small server requirements.
The small business organizations have less than twenty five people working in the organization. They do not put lot of demand on the network sever. Many a times their sales offices are also in the remote places. These people need a network server appliance. There are five critical server functions in the modern world. This is web, email and print. The remaining two are FTP and file. If these five server critical functions are available in the network server appliance, then the small businessman will be more than happy. These are basic features. The additional two features that a small businessman will expect in his network server appliance are VPN and remote user support. The hardware is provided free in this type of network server appliance. There are many branded companies providing different additional features in this type of network server appliance. The small companies always want easy to use systems. They feel they should not require any technical support.
The network server appliance provides the technical support in inexpensive manner. The small business gets this network server support in a very convenient manner when he uses a network server appliance.
There are companies which will provide you Linux based software. This is a customized software. The small businessman can just add hardware and thereby make his own network server appliance. This can be as per your exact needs and very cost effective too. This is not as easy as it seems. You need certain experience. You must have an experience of choosing correct Linux compatible drives and put them together on the standard PC. The configuration with Linux may also be a little difficult. The network server appliance is convenient as it can give you hardware and software matching capabilities.
The network server appliance always consumes very less power. This is one more reason for selecting them. You have got a low end PC. There are companies which turn this low end PC into network server appliance. For this these companies use Linux software. The small range jobs are well handled by this type of network server appliance.
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I’ve never set up OpenVPN but in reading your question I wonder how you are going to prevent your base machine from being compromised. Your VM idea is good, but the ports still would need to be opened to the base machine which means access from the outside is to your base machine. The VM is only bridged or NAT’d to your existing open connection. In order to restart the VM image you still need external access to your base machine. I suppose something like go to my PC would solve that issue but not the one of open ports to your main machine.