Managing the LTE | 169
Aprisa LTE User Manual 2.1
VPN > GRE
This page provides VPN Generic Routing Encapsulation (GRE) configuration.
GRE encapsulates data inside IP packets and routes it over an IP network through virtual point to point links.
It is a simple encapsulation protocol allowing both L2 and L3 networks to be joined through a tunnel. A
virtual interface is created, and route table entries are used to send traffic into the tunnel interface (for
L3 tunnels), or the interface is joined to a bridge (for L2 tunnels).
Data in a GRE tunnel is NOT encrypted. IPSec can be used to encrypt GRE tunnels.
Mode
IP over GRE is a L3 tunnel for IP packets (both IPv4 and IPv6) over IPv4 networks.
IP over GREv6 is a L3 tunnel for IP packets (both IPv4 and IPv6) over IPv6 networks.
Ethernet over GRE/GREv6 options transport L2 packets of any type over networks of IPv4 or IPv6
respectively.
Tunnel Name
Name of the tunnel
Tunnel IPv4 address/netmask
This defines the IPv4 address and netmask of the virtual interface used for routing. Not valid for Ethernet
over GRE/GREv6.
Tunnel IPv6 address/prefix
This defines the IPv6 address and prefix of the virtual interface used for routing. Not valid for Ethernet over
GRE/GREv6.
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