29
3.8.2.3
GRE
Generic Routing Encapsulation (GRE) is a communication protocol used to establish a direct, point-to-point
connection between network nodes. GRE lets two peers share data they would not otherwise be able to
share over the Internet. GRE encapsulates a wide variety of network layer protocols inside virtual point-to-
point links over the IP network. To use GRE VPN, enable VPN and select GRE as the protocol (Figure 47).
Complete the parameters per Table 14.
Figure 47: GRE
Table 14: GRE
Field Name
Description
VPN
Click on the check box to enable VPN
Protocol
GRE
Default GW
Click on the check box to enable a default gateway
Server IP
Server IP address
Local IP
Local IP address
Remote IP
Remote IP address
3.8.3 OpenVPN
OpenVPN is an open-source, Virtual Private Network (VPN) encryption protocol. As well as being extremely
secure, OpenVPN is highly customizable and can be implemented in a number of different ways. For that
reason, using this VPN method requires significant networking experience to implement. The range of
options includes remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access
solutions. The remote access solutions support robust capabilities such as load balancing, failover, and more
granular access controls, e.g., articles, examples, security overview, and non-English languages.
OpenVPN implements OSI Layer 2 or 3 secure network extension using the industry standard SSL/TLS protocol.
It supports flexible client authentication methods based on certificates, smart cards, and/or two-factor
authentication, and allows user or group-specific access control policies using firewall rules applied to the
VPN interface. Setting up OpenVPN involves configuring server and client settings. Refer to Figure 48, Figure
49 (server), and Figure 50 (client) configuration fields.
