Choose connection type as ‘bidirectional.’ Then select the public IP for the ‘Interface’ option. Next, type a name for your configuration. Next, click on “ Tunneling Protocols” and “ IPSec LAN-to-LAN.” Finally, click ‘ ADD.’ To start configuration, select ‘ Configuration’ and the click on ‘ System’. To configure the IPSec parameters for the VPN, you need use the same authentication and encryption parameters that you used in the router. To add the network address, click on ‘ ADD’ and then name it and type the local network address as shown in the screen shot below:Īfter adding the local network address, you need to add the remote network address using the same procedures that you used to add the local network address. Next select traffic management and click on “ network list”.
To add the network address, click on ‘ Configuration’ and then click on “Policy Management”. This process is equivalent to creating the access list in the router in order to specify the source and destination network of the VPN. You have to add both the local and the remote( router side) network address in the concentrator. If your concentrator is already configured with tunnel default gateway and default gateway, you do not have to do configure anything else. By the term “ default gateway” we mean the public IP of the concentrator, which will be connected to the Internet. The tunnel default gateway is the concentrator’s internal interface IP that will be connected to the internal network. Router(config)#crypto map myvpnmap ( choose any name you want)īefore start configuring the VPN parameters in the concentrator, you need to add default gateway and tunnel default gateway. Router(config)#set transform-set myvpnset Router(config)#crypto map mymap 10 ipsec-isakmp The only purpose of creating map is to apply it in an interface. After creating the ISAKMP policy and the IPSec parameters in the step 1 and step 2, you need to associate them with a map. Router(config)# access-list 100 permit ip 10.0.0.0 0.255.255.255 20.0.0.0 0.255.255.255Ī crypto map is a template that contains the ISAKMP policy and IPSec parameters of the tunnel. For example, the network 10.0.0.0 is connected to your router and you want it to communicate with the 20.0.0.0 network connected with the VPN concentrator. The local network connected to the route is considered as source and the remote network, the network connected to the concentrator, will be considered as destination network. You must include the source and the destination network address in your list. If you have a number of networks connected to your router and you want to allow all of them to use the VPN tunnel then you need to create access list for each of them separately. This access list is used to specify who will be allowed to use the tunnel.
Router(config)#crypto ipsec security-association lifetime seconds 28800 Router(config)#crypto ipsec-transform-set myvpnsetesp-aes 128 esp-md5-hmac Following are the command used to build ISAKMP policy:Īfter confiruing your policy, verify it in the outer using the following command: This is used to identify and to negotiate between the two devices that will be part of the VPN. You can follow the following five simple steps to configure VPN in your router.
To build the tunnel you have to configure the router and use the exact same crypto configuration in the concentrator.
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