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Configure GRE over IPSec side-to-side tunnel using SDM 
 
•  Click configure icon to enter configuration page. 
•  Click VPN icon. 
•  Choose site-to-site VPN wizard 
•  Click create site-to-site VPN tab. 
•  Click create secure GRE tunnel (GRE over IPSec) radio button. 
•  Click launch the selected task. 
 
GRE tunnel information 
 
•  Specify GRE tunnel source IP address and destination IP address. 
•  Define the IP address & subnet mask that are applied to virtual point-to-point link. 
•  Click next 
•  Optionally w can create second GRE tunnel and click next. 
•  IPSec – specific parameters : 
-Click preshared keys authentication method radio button. 
-Specify preshared key and click next 
•  IKE proposals 
-Click add button and create custom IKE policy & click next. 
•  Transform-set 
-Click add button and specify parameters and click next. 
•  Select the routing protocol 
-Select OSPF routing protocol radio button. 
-Define router OSPF process ID & area number for tunnel. 
-Define one or more local subnets to be advertised to OSPF neighbors. 
•  At the end, the wizard will present a summary of the configured parameters and 
   click finish to complete the configuration. 
•  Verification 
-Click test tunnel button and also click monitor icon to display the status of the tunnel.
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