A site-to-site VPN is used when multiple local networks are to be connected to a virtual communication network, via a public transport medium. Such scenarios are possible, for example, when connecting different company locations with one another. Alternatively, location networks can also be realized, in the form of a corporate network. Corporate networks are based on a private fixed connection, but companies have to rent the corresponding infrastructure first in order to use it. A connection via VPN, on the other hand, relies on a public network. Here an internet connection is the only cost involved. Creating a site-to-site VPN also requires a VPN router; these are needed to build the connection between the VPN tunnel and the local network. Other terms used to describe a site-to-site VPN include: LAN-to-LAN or Branch-Office VPNs.