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Configuring the Cisco ASA IPSec VPN

Nov 15, 2013

📄 Contents

␡

IPsec Basics
Phase 1 IKE Policy
Phase 2 IKE IPSec Transform Sets (v1) and Proposals (v2)
Basic ASA IPsec VPN Configuration
Basic ASA IPsec VPN Configuration Examples
IPsec IKEv1 Example
IPsec IKEv2 Example

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Basic ASA IPsec VPN Configuration

To make this article a little clearer (and easier for the reader) the configuration command steps that are covered within this section stick with a static LAN to LAN IPSec VPN.

The commands that would be used to create a LAN-to-LAN IPsec (IKEv1) VPN between ASAs are shown in Table 1.

Table 1: ASA IKEv1 LAN-to-LAN IPsec Configuration Commands

1	Create and enter IKEv1 policy configuration mode. Note: The lower the policy-priority, the higher the priority with a valid range from 1–65535.	asa(config)#crypto ikev1 policy policy-priority
2	Configure an authentication method (default: pre-share).	asa(config-ikev1-policy)#authentication {`pre-share \| rsa-sig`}
3	Configure an encryption method (default: 3des).	asa(config-ikev1-policy)#encryption {`des \| 3des \| aes \| aes-192 \| aes-256`}
4	Configure a hash method (default: sha).	asa(config-ikev1-policy)#hash {`md5 \| sha`}
5	Configure a Diffie-Hellman (DH) group (default: 2).	asa(config-ikev1-policy)#group {1 \| 2 \| 5}
6	Configure the IKE SA lifetime (Default: 86400 seconds [24 hours]).	asa(config-ikev1-polocy)#lifetime lifetime
7	Enable IKEv1 on an interface. Note: This is the interface that goes out to the IPsec destination.	asa(config)#crypto ikev1 enable interface-name
8	Create an IKEv1 Transform set. Notes: encryption-method can be esp-des, esp-3des, esp-aes, esp-aes-192, esp-aes-256, or esp-null. authentication-method can be esp-md5-hmac, esp-sha-hmac or esp-none.	asa(config)#crypto ipsec ikev1 transform-set set-name encryption-method authentication-method
9	Create an access-list to specify the interesting traffic to be encrypted within the IPsec tunnel. Note: This is a very simplified version of an ACL; for further details on ACLs, see my "ASA Access Lists Concepts and Configuration" article.	asa(config)#access-list acl-name extended {`permit \| deny`} `protocol source-network source-netmask destination-network destination-netmask`
10	Specify the tunnel group type. Notes: Because this example is for a LAN-to-LAN IPsec tunnel the ipsec-l2l tunnel mode is used. The tunnel-group-name is almost always set to the peer IP address for LAN-to-LAN IPsec tunnels.	asa(config)#tunnel-group tunnel-group-name type ipsec-l2l
11	Enter IPsec tunnel attribute configuration mode.	asa(config)#tunnel-group tunnel-group-name ipsec-attributes
12	Configure the IPsec tunnel pre-shared key or certificate trustpoint.	asa(config-tunnel-ipsec)#ikev1 {`pre-shared-key pre-shared-key \| trustpoint trustpoint`}
13	Create a crypto map and match based on the previously created ACL.	asa(config)#crypto map map-name sequence-number match address acl-name
14	Configure the peer IP address.	asa(config)#crypto map map-name sequence-number set peer peer-ip-address
15	Assign the previously created transform set.	asa(config)#crypto map map-name sequence-number set ikev1 transform-set set-name
16	Apply the crypto map to an interface.	asa(config)#crypto map map-name interface interface-name

The commands that would be used to create a LAN-to-LAN IPsec (IKEv2) VPN between ASAs are shown in Table 2:

Table 2: ASA IKEv2 LAN-to-LAN IPsec Configuration Commands

1	Create and enter IKEv2 policy configuration mode. Note: The lower the policy-priority, the higher the priority with a valid range from 1–65535.	asa(config)#crypto ikev2 policy policy-priority
2	Configure an encryption method (default: 3des).	asa(config-ikev2-policy)#encryption {`des \| 3des \| aes \| aes-192 \| aes-256 \| null`}
3	Configure a hash method (default: sha).	asa(config-ikev2-policy)#integrity {`md5 \| sha \| sha-256 \| sha-384 \| sha-512`}
4	Configure a Diffie-Hellman (DH) group (default: 2).	asa(config-ikev2-policy)#group {1 \| 2 \| 5 \| 14 \| 19 \| 20 \| 21 \| 24}
5	Configure the Pseudo-Random Function (PRF) (Default: SHA).	asa(config-ikev2-policy)#prf {`md5 \| sha \| sha256 \| sha256 \| sha384 \| sha512`}
6	Configure the IKE SA lifetime (Default: 86400 seconds [24 hours]).	asa(config-ikev2-polocy)#lifetime seconds lifetime
7	Enable IKEv2 on an interface. Note: This is the interface that goes out to the IPsec destination	asa(config)#crypto ikev2 enable interface-name
8	Create an IKEv2 Proposal and enter proposal configuration mode.	asa(config)#crypto ipsec ikev2 ipsec-proposal proposal-name
9	Configure the IKEv2 proposal encryption method (Default: 3DES).	asa(config-ipsec-proposal)#protocol esp encryption {`des \| 3des \| aes \| aes-192 \| aes-256 \| null`}
10	Configure the IKEv2 proposal authentication method. (Default: SHA-1)	asa(config-ipsec-proposal)#protocol esp integrity {`md5 \| sha-1 \| null`}
11	Create an access-list to specify the interesting traffic to be encrypted within the IPsec tunnel. Note: This is a very simplified version of an ACL; for further details on ACLs see my "ASA Access Lists Concepts and Configuration" article.	asa(config)#access-list acl-name extended {`permit \| deny`} `protocol source-network source-netmask destination-network destination-netmask`
12	Specify the tunnel group type. Notes: Because this example is for a LAN-to-LAN IPsec tunnel, the ipsec-l2l tunnel mode is used. The tunnel-group-name is almost always set to the peer IP address for LAN-to-LAN IPsec tunnels.	asa(config)#tunnel-group tunnel-group-name type ipsec-l2l
13	Enter IPsec tunnel attribute configuration mode.	asa(config)#tunnel-group tunnel-group-name ipsec-attributes
14	Configure the local IPsec tunnel pre-shared key or certificate trustpoint.	asa(config-tunnel-ipsec)#ikev2 local-authentication {`pre-shared-key pre-shared-key \| certificate trustpoint`}
15	Configure the remote IPsec tunnel pre-shared key or certificate trustpoint.	asa(config-tunnel-ipsec)#ikev2 remote-authentication {`pre-shared-key pre-shared-key \| certificate trustpoint`}
16	Create a crypto map and match based on the previously created ACL.	asa(config)#crypto map map-name sequence-number match address acl-name
17	Configure the peer IP address.	asa(config)#crypto map map-name sequence-number set peer peer-ip-address
18	Assign the previously created proposal.	asa(config)#crypto map map-name sequence-number set ikev2 ipsec-proposal proposal-name
19	Apply the crypto map to an interface.	asa(config)#crypto map map-name interface interface-name

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