R1(config-crypto-map)#match address IPSEC_List R1(config-crypto-map)#set transform-set TSET % NOTE: This new crypto map will remain disabled until a peerĪnd a valid access list have been configured. R1(cfg-crypto-trans)#crypto map CMAP 1 ipsec-isakmp This ACL (Access Control List) will match the traffic of our Local LAN and we will use this ACL in Crypto MAP Configuration. R1(config)#ip access-list extended IPSEC_List Now, we need to configure the Extended ACL and Crypto MAP to match the traffic. R1(config)#crypto ipsec transform-set TSET esp-3des esp-md5-hmac Configuring the Extended ACL and Crypto MAP
Along with the Protocol, we also need to define the Encryption and Hashing algorithms. AH (Authentication Header) or ESP (Encapsulation Security Payload). Here, you need to define the IPSec Protocol i.e. Now, we need to configure the IPSec VPN Phase 2 Parameters. R1(config)#crypto isakmp key Gns3Network address 2.2.2.2 Configuring the Phase 2 on the Cisco Router R1 I am using Gns3Network as a Pre-Shared Key. Access the global configuration mode of the router and define the Pre-Shared key. R1(config-isakmp)#authentication pre-share Lifetime: 86400 ( Default lifetime for the Phase1)Įnter configuration commands, one per line.Authentication: In this example, we are using the pre-shared key as authentication).Hash: md5 ( md5 is a hashing algorithm.Encryption: 3des (It is used to encrypt the Phase1 traffic).For ISAKMP Phase1, we will use the following parameters: You need to access the global configuration mode of the Cisco Router and configure the below parameters.
Now, we will configure the Phase 1 Parameters on Router1. I assumed that you have reachability to the Remote Network. After that, we will move on router two and configure all the required configuration.Ĭonfiguring the IPSec Tunnel on Cisco Router 1 Configuring the Phase 1 on the Cisco Router R1
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How to Configure IPSec VPN on Cisco Routersįirst, we will configure all the configurations on Router1. Also, we need to provide a Pre-Shared Key during Phase1 Configuration. Along with the IP addresses, we also have to configure ISAKMP Phase 1 and ISAKMP Phase 2 ( IPSec). Success rate is 100 percent (5/5), round-trip min/avg/max = 24/31/40 msĪs earlier discussed, we must have static routable IP addresses to establish an IPSec tunnel.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds: You must verify the connectivity between R1 and R2. On the other hand, Router R2 connected with the ISP using public IP 2.2.2.2 and the LAN subnet is 192.168.2.0/24. Router R1 connected with the ISP using public IP 1.1.1.1, and the LAN subnet is 192.168.1.0/24. Here, we have two different Cisco Routers at different locations. Scenario – How to Configure IPSec VPN between Cisco Routers
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