Vnc remote server
If, for example, a computer with IP-address 192.168.1.10, located on the internal network, located in the DMZ-zone, itself a local network protected by a router, then when you receive a request to any port on the external network address WAN-port router that request will be forwarded to the IP-address 192.168.1.10, that is, the address of the computer in the DMZ-zone.vnc tools
Because the computer is placed in the DMZ-zone, is available from the external network and is not protected by a firewall, it becomes vulnerable point network. To resort to placing computers in the DMZ should be only a last resort when no other ways to circumvent the limitations of NAT for one reason or another do not fit.
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Remote desktop viewer
The most common small business remote access to a computer located on the internal network, the so-called static port forwarding. Static port redirection technology allows to make accessible from the external network specific applications running on a computer on the internal network. In order to realize the port forwarding in your router, you must specify the mapping between the ports used by specific applications, and IP-addresses of the computers inside the network on which these applications work (such computers are called virtual servers). As a result of any request from the external network to the external IP-address of the router for specified port will be automatically redirected to the specified virtual server inside the network.
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For example, if the internal network is configured virtual server that runs on a PC with IP-address 192.168.0.10, then set up a virtual server specified IP-address virtual server (192.168.0.10), port and protocol used by applications that you want to get access from the outside. For example, if an application uses TCP port 12345 and then when you apply for an external IP-address of the router port 12345 users outside the network can access the application virtual server on the internal network, despite the use of the protocol NAT.