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It would be great if you could practice with GNS3 MV to verify your understanding. Now you should be able to configure IPSec VPN site-to-site between Cisco ASA firewall appliance with IOS version 9.x with Cisco router. This could be done with the deny statement in top of the NAT ACL. In this case, we need to configure router not to NAT the IPSec VPN traffic otherwise VPN tunnel would not be up. #ip nat inside source list ACL-DNAT interface f0/1 overload Normal, Dynamic NAT is configured on Cisco router to provide internet access to all computers within Local Area Network (LAN). Set security-association lifetime seconds 86400 5.9 IPSec VPN With Dynamic NAT on Cisco Router On HOFW01 #crypto map HO-VPN 1 set security-association lifetime seconds 86400 If it is required, the following are the commands to configure it. Without it the VPN tunnel still up and running. IPSec security lifetime and PFS is optional. #sh crypto sessionĥ.8 IPSec Security Lifetime and PFS (Optional)
Cisco asav routing how to#
Check section 5.8 below for how to change it.Īnd with the following command on BORT01. Even thought we did not configure the value of 3600, it is come by default. #sh vpn-sessiondb detail l2l filter ipaddress 117.168.100.2 We can verify it with the following command on HOFW01. Let test to ping from PC1 in head office to PC2 in branch office.Īs we are successful to ping IP of host on the remote site, the IPSec VPN tunnel should be up and running now. To bring up the IPSec VPN site-to-site tunnel, we need to ping the IP address of the host in the remote site. On BORT01 #crypto map BO-VPN 1 ipsec-isakmpĬrypto map BO-VPN 5.7 Test and Verify the Configuration #crypto map HO-VPN 1 set ikev1 transform-set HO-TRSET01-3DES-MD5
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On HOFW01 #crypto map HO-VPN 1 match address ACL-HO2BO The following are the commands to be executed Now come to the final step that we need to configure the crypto map to combine IPsec transform set, access list, and tunnel group configured in the previous steps for that specific VPN peer and apply it to the interface that connected to the internet. Ikev1 pre-shared-key BORT01 #crypto isakmp key 0 address 203.200.200.2 5.6 Configure and Apply Crypto Map Pre-shred key authentication is to be configured here. Permit ip host 172.16.20.10 host 10.10.10.10 5.5 Create VPN Tunnel GroupĬreate a tunnel group for IPSec VPN site-to-site connection. #access-list ACL-HO2BO extended permit ip object-group HO-Server object-group BO-ServerĬreate the following ACL on BORT01. To match the traffic for IPSec VPN tunnel, an ACL must be created.Ĭreate the following ACL on HOFW01. #crypto ipsec transform-set BO-TRSET01-3DES-MD5 esp-3des esp-md5-hmac 5.4 Create ACL For VPN Tunnel #crypto ipsec ikev1 transform-set HO-TRSET01-3DES-MD5 esp-3des esp-md5-hmacĪpply the follow configuration on BORT01 to create a transform set name “BO-TRSET01-3DES-MD5”. Apply the follow configuration on HOFW01 to create a transform set name “HO-TRSET01-3DES-MD5”. Next we need to create a transform set to establishes the encryption and authentication for IPSec tunnel. It will encrypted communication channels between the two VPN endpoints. Now both HOFW01 and BORT01 should be able to ping their public IP each other.Ĭonfigure IKE to negotiate an security SA (Security Association) relationship with the peer. Configuration 5.1 Configure Default RouteĪpply the the following default router configuration The following is the information that IPSec VPN site-to-site will be used to in the configuration. The following is the IP configuration of each device. The following network diagram of GNS3 Lab will be used to demonstrate configuring IPSec VPN site-to-site between Cisco ASA firewall with IOS version 9.x and Cisco router.Ĭisco ASA firewall appliances, with host name HOFW01 locates in head office and Cisco router with host name BORT1 locates in branch office.