This guide describes Generic Routing Encapsulation (GRE) and its configuration. GRE is a mechanism for encapsulating any network layer protocol over any other network layer protocol. GRE can be used in point-to-point mode to provide a VPN between two sites.
Additionally, GRE can be used for Multipoint Virtual Private Networks (VPNs) using GRE in point-to-multipoint mode. Multipoint VPNs simplify configuration and allow a single tunnel interface to have multiple endpoints. For example, this means that only a single virtual tunnel interface configuration is required in a main office to connect to all other remote offices.
This guide describes Generic Routing Encapsulation (GRE) and its configuration on AlliedWare Plus.
