Cisco 1812W - Integrated Services Router Wireless Configuration Manual page 94

Configure a GRE Tunnel
Apply the Crypto Map to the Physical Interface
The crypto maps must be applied to each interface through which IPSec traffic flows. Applying the
crypto map to the physical interface instructs the router to evaluate all the traffic against the security
associations database. With the default configurations, the router provides secure connectivity by
encrypting the traffic sent between remote sites. However, the public interface still allows the rest of the
traffic to pass and provides connectivity to the Internet.
Perform these steps to apply a crypto map to an interface, beginning in global configuration mode:
Command or Action
Step 1
interface type number
Example:
Router(config)# interface fastethernet 0
Router(config-if)#
Step 2 crypto map map-name
Example:
Router(config-if)# crypto map static-map
Router(config-if)#
Step 3 exit
Example:
Router(config-if)# exit
Router(config)#
Configure a GRE Tunnel
Perform these steps to configure a GRE tunnel, beginning in global configuration mode:
Command or Action
Step 1 interface type number
Example:
Router(config)# interface tunnel 1
Router(config-if)#
Step 2 ip address ip-address mask
Example:
Router(config-if)# 10.62.1.193
255.255.255.252
Router(config-if)#
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
7-8
Chapter 7 Configuring VPNs Using an IPSec Tunnel and Generic Routing Encapsulation
Purpose
Enters interface configuration mode for the
interface to which you want to apply the crypto
map.
Applies the crypto map to the interface.
See th e
for more detail about this command.
Enters global configuration mode.
Purpose
Creates a tunnel interface and enters interface
configuration mode.
Assigns an address to the tunnel.
Cisco IOS Security Command Reference
OL-6426-02