Virtual Private Networks (VPN) Generic Routing Encapsulation (GRE)
Digi Connect EZ Mini User Guide
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Example: GRE tunnel over an IPSec tunnel
The Connect EZ device can be configured as an advertised set of routes through an IPSec tunnel. This
allows you to leverage the dynamic route advertisement of GRE tunnels through a secured IPSec
tunnel.
The example configuration provides instructions for configuring the Connect EZ device with a
GREtunnel through IPsec.
Connect EZ-1 configuration tasks
1. Create an IPsec tunnel named ipsec_gre1 with:
n A pre-shared key.
n Remote endpoint set to the public IP address of the Connect EZ-2 device.
n A policy with:
l Local network set to the IP address and subnet of the local GRE tunnel,
172.30.0.1/32.
l Remote network set to the IP address and subnet of the remote GRE tunnel,
172.30.0.2/32.
2. Create an IPsec endpoint interface named ipsec_endpoint1:
a. Zone set to Internal.
b. Device set to Ethernet: Loopback.
c. IPv4 Address set to the IP address of the local GRE tunnel, 172.30.0.1/32.
3. Create a GRE tunnel named gre_tunnel1:
a. Local endpoint set to the IPsec endpoint interface, Interface: ipsec_endpoint1.
b. Remote endpoint set to the IP address of the GRE tunnel on Connect EZ-2, 172.30.0.2.
4. Create an interface named gre_interface1 and add it to the GRE tunnel:
a. Zone set to Internal.
b. Device set to IP tunnel: gre_tunnel1.
c. IPv4 Address set to a virtual IP address on the GRE tunnel, 172.31.0.1/30.
Connect EZ-2 configuration tasks
1. Create an IPsec tunnel named ipsec_gre2 with:
n The same pre-shared key as the ipsec_gre1 tunnel on Connect EZ-1.
n Remote endpoint set to the public IP address of Connect EZ-1.
n A policy with:
l Local network set to the IP address and subnet of the local GRE tunnel,
172.30.0.2/32.
l Remote network set to the IP address of the remote GRE tunnel, 172.30.0.1/32.
2. Create an IPsec endpoint interface named ipsec_endpoint2:
a. Zone set to Internal.
b. Device set to Ethernet: Loopback.
c. IPv4 Address set to the IP address of the local GRE tunnel, 172.30.0.2/32.
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