Openvpn Protocol - Hirschmann OWL LTE M12 User Manual

OpenVPN protocol

2 OpenVPN protocol
The OpenVPN (Open Virtual Private Network) program is a means of
interconnecting several computers through an untrusted public network. It is
possible for connected computers to communicate with each other as if they
were connected in a single closed private network. The closed private
network is consequently trusted. Using the client-server architecture, The
OpenVPN program is capable of establishing a direct connection between
computers behind NAT (Network Address Translation) without any need to
configure NAT. The OpenVPN program has a few ways to authenticate
clients for example, a pre-shared key, an X.509 certificate, or a username
and password.
The OpenVPN program uses the officially assigned UDP port 1194, which is
applied as the default in newer versions. The OpenVPN program offers 2
types of network interfaces, the Universal TUN and the TAP driver. The
drivers allow you to create an IP tunnel (TUN) on layer 3 of the ISO/OSI or
an Ethernet TAP on layer 2. The Universal TUN and the Ethernet TAP are
able to transmit any type of data. The OpenVPN program uses the common
network protocols (TCP and UDP) and thus creates an alternative to the
IPsec protocol.
Figure 80: Basic scheme
UM Configuration OWL LTE M12
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Release 01.2.02 Rev. 01 - 06/2018