Configuration
4.8 Security
CP 1243-1
58 Operating Instructions, 12/2016, C79000-G8976-C365-02
VPN (Virtual Private Network)
VPN tunnel
Virtual Private Network (VPN) is a technology for secure transportation of confidential data in
public IP networks, for example the Internet. With VPN, a secure connection (tunnel) is set
up and operated between two secure IT systems or networks via a non-secure network.
One of the main features of the VPN tunnel is that it forwards all frames even from protocols
of higher layers (HTTP, FTP etc.).
The data traffic between two network components is transported practically unrestricted
through another network. This allows entire networks to be connected together via a
neighboring or intermediate network.
● VPN forms a logical subnet that is embedded in a neighboring (assigned) network. VPN
uses the usual addressing mechanisms of the assigned network, however in terms of the
data, it transports its own frames and therefore operates independent of the rest of this
network.
● VPN allows communication of the VPN partners with the assigned network.
● VPN is based on tunnel technology and can be individually configured.
● Communication between the VPN partners is protected from eavesdropping or
manipulation by using passwords, public keys or a digital certificate (authentication).
● Local area networks can be connected together securely via the Internet ("site-to-site"
connection).
● Secure access to a company network ("end-to-site" connection)
● Secure access to a server ("end-to-end" connection)
● Communication between two servers without being accessible to third parties (end-to-end
or host-to-host connection)
● Ensuring information security in networked automation systems
● Securing the computer systems including the associated data communication within an
automation network or secure remote access via the Internet
● Secure remote access from a PC/programming device to automation devices or networks
protected by security modules via public networks.
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