Technical data

Configure GRE Tunnels

Figure 11: Example GRE Tunneling Configuration

To configure GRE tunneling, create the GRE tunnel profile as well as an ESSID that

specifies the GRE tunnel and also references a Security Profile. GRE can also be

configured from E(z)RF Network Manager.

All IP addresses configured for the tunnel must be unique; these IP addresses define

the endpoints of the tunnel, with the controller FastEthernet IP address defining

the local endpoint and the ip remote-external-address specifying the remote

endpoint.The ip tunnel-ip-address defines the tunnel network.

The following example shows the commands for configuring a GRE tunnel profile on

the second FastEthernet interface, where the IP address of the tunnel’s local

endpoint is 13.13.13.13 and the remote endpoint is 172.27.0.206, and the DHCP

server is at 10.0.0.12:

default(config)# gre guest

default(config-gre)# interface FastEthernet controller 2

default(config-gre)# ip tunnel-ip-address 13.13.13.13 255.255.255.0

default(config-gre)# ip remote-external-address 172.27.0.206

default(config-gre)# ip dhcp-override

default(config-gre)# ip dhcp-server 10.0.0.12

default(config-gre)# end

To check the configuration of the GRE tunnel, use the show gre command:

Note:

If the GRE Tunnel is to be configured on the second interface of a

Dual-Ethernet configuration, be sure to configure the second Ethernet

interface, as described in the section “Configuring an Active Interface” in the

chapter “Configuring Network Interfaces.”