IKEv2 IPsec Site-to-Site VPN configuration on Cisco ASA 8.4(x)

Though the crypto IKEv2 proposal command looks similar to the IKEv1 crypto isakmp policy command, there are many differences in how IKEv2 negotiates. Unlike IKEv1, the authentication method and SA lifetime are not negotiable in IKEv2, and they cannot be configured in the IKEv2 proposal. Also the IKEv2 proposal configuration supports specifying multiple options for each transform type and we can configure different pre-shared-key for local and remote authentication. Pseudo-Random Function (PRF) algorithm  is the same as the integrity algorithm, and hence, it is not configured separately. Our goal is to configure site-to-site or l2l IKEv2 IPsec VPN between ASA1 and ASA2 which are running IOS 8.4(2). IP addressing scheme is mentioned in the network diagram.

 

 ASA1

 interface GigabitEthernet1
 nameif OUTSIDE
 security-level 0
 ip address 180.1.1.2 255.255.255.252
!
interface GigabitEthernet2
 nameif INSIDE
 security-level 100
 ip address 172.16.0.2 255.255.255.0
!
access-list VPN extended permit ip 172.16.0.0 255.255.252.0 192.168.0.0 255.255.252.0
!
crypto ipsec ikev2 ipsec-proposal VPNPRPSL
 protocol esp encryption aes-256
 protocol esp integrity sha-1
crypto map VPNMAP 1 match address VPN
crypto map VPNMAP 1 set peer 190.1.1.2
crypto map VPNMAP 1 set ikev2 ipsec-proposal VPNPRPSL
crypto map VPNMAP interface OUTSIDE
crypto ikev2 policy 1
 encryption aes-256
 integrity sha256
 group 2
 prf sha
 lifetime seconds 86400
crypto ikev2 enable OUTSIDE
!
tunnel-group 190.1.1.2 type ipsec-l2l
tunnel-group 190.1.1.2 ipsec-attributes
 ikev2 remote-authentication pre-shared-key cisco
 ikev2 local-authentication pre-shared-key cisco123

ASA2

interface GigabitEthernet1
 nameif OUTSIDE
 security-level 0
 ip address 190.1.1.2 255.255.255.252
!
interface GigabitEthernet2
 nameif INSIDE
 security-level 100
 ip address 192.168.0.2 255.255.255.0 
!
access-list VPN extended permit ip 192.168.0.0 255.255.252.0 172.16.0.0 255.255.252.0
!
crypto ipsec ikev2 ipsec-proposal VPNPRPSL
 protocol esp encryption aes-256
 protocol esp integrity sha-1
crypto map VPNMAP 1 match address VPN
crypto map VPNMAP 1 set peer 180.1.1.2
crypto map VPNMAP 1 set ikev2 ipsec-proposal VPNPRPSL
crypto map VPNMAP interface OUTSIDE
crypto ikev2 policy 1
 encryption aes-256
 integrity sha256
 group 2
 prf sha
 lifetime seconds 86400
crypto ikev2 enable OUTSIDE
!
tunnel-group 180.1.1.2 type ipsec-l2l
tunnel-group 180.1.1.2 ipsec-attributes
 ikev2 remote-authentication pre-shared-key cisco123
 ikev2 local-authentication pre-shared-key cisco



ASA2# sh crypto ikev2 sa detail
IKEv2 SAs:
Session-id:1, Status:UP-ACTIVE, IKE count:1, CHILD count:1
Tunnel-id                 Local                Remote     Status         Role
  9617881         190.1.1.2/500         180.1.1.2/500      READY    RESPONDER
      Encr: AES-CBC, keysize: 256, Hash: SHA256, DH Grp:2, Auth sign: PSK, Auth verify: PSK
      Life/Active Time: 86400/186 sec
      Session-id: 1
      Status Description: Negotiation done
      Local spi: 1D72FACA014E0232       Remote spi: 85A271A5A90EBC64
      Local id: 190.1.1.2
      Remote id: 180.1.1.2
      Local req mess id: 6              Remote req mess id: 8
      Local next mess id: 6             Remote next mess id: 8
      Local req queued: 6               Remote req queued: 8
      Local window: 1                   Remote window: 1
      DPD configured for 10 seconds, retry 2
      NAT-T is not detected 
Child sa: local selector  192.168.0.0/0 - 192.168.3.255/65535
          remote selector 172.16.0.0/0 - 172.16.3.255/65535
          ESP spi in/out: 0x351a8276/0x31d76ed6 
          AH spi in/out: 0x0/0x0 
          CPI in/out: 0x0/0x0 
          Encr: AES-CBC, keysize: 256, esp_hmac: SHA96
          ah_hmac: None, comp: IPCOMP_NONE, mode tunnel


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