Configure IKEV1 Site to Site VPN between Cisco ASA and Paloalto Firewall

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In this guide, we are configuring IKEV1 VPN between Cisco ASA and Paloalto firewall. This is applicable to all models of Cisco and PA firewalls.

Configure Cisco ASA:

1) Phase 1: IKE policy

ciscoasa(config)# crypto ikev1 policy 10
ciscoasa(config-ikev1-policy)# authentication pre-share
ciscoasa(config-ikev1-policy)# encryption 3des
ciscoasa(config-ikev1-policy)# hash sha
ciscoasa(config-ikev1-policy)# group 2
ciscoasa(config-ikev1-policy)# lifetime 86400

ciscoasa(config)# crypto ikev1 enable outside

 

2) Phase 2: IPSec proposal

ciscoasa(config)# crypto ipsec ikev1 transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac

 

3) Network Objects and ACL

ciscoasa(config)# object-group network india_network
ciscoasa(config-network-object)#  network-object 10.10.10.0 255.255.255.0

ciscoasa(config)# object-group network singapore_network
ciscoasa(config-network-object)#  network-object 192.168.1.0 255.255.255.0

ciscoasa(config)# nat (inside,outside) source static india_network india_network destination static singapore_network singapore_network
ciscoasa(config)# access-list ind_sin_acl extended permit ip object-group india_network object-group singapore_network

 

4) Cryptomap

ciscoasa(config)# crypto map outside_map 5 match address ind_sin_acl
ciscoasa(config)# crypto map outside_map 5 set peer 2.2.2.2
ciscoasa(config)# crypto map outside_map 5 set ikev1 transform-set ESP-3DES-MD5

ciscoasa(config)# crypto map outside_map 5 set pfs group2

ciscoasa(config)# crypto map outside_map interface outside

Defaults

crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000

 

5) Group Policy and Tunnel Interface

Create a Group policy for ikev1 vpn protocol and assign to tunnel interface.

ciscoasa(config)# group-policy GrpPolicy-2.2.2.2 internal
ciscoasa(config)# group-policy GrpPolicy-2.2.2.2 attributes
ciscoasa(config)#  vpn-tunnel-protocol ikev1

ciscoasa(config)# tunnel-group 2.2.2.2 type ipsec-l2l
ciscoasa(config)# tunnel-group 2.2.2.2 ipsec-attributes
ciscoasa(config-tunnel-ipsec)#  ikev1 pre-shared-key cisco
ciscoasa(config)# tunnel-group 2.2.2.2 general-attributes
ciscoasa(config)# default-group-policy GrpPolicy-2.2.2.2

 

Configure Paloalto Firewall:

1) Phase 1: IKE Profile. Navigate to Network > Network Profiles > IKE Crypto

PA considers 86400 seconds lifetime to be too large and doesn’t accept. 86400 seconds is equivalent to 24 hours, hence I specified lifetime as 24 hours in PA firewall.

 

2) Phase 2: IPSec Profile. Navigate to Network > Network Profiles> IPSec Crypto

 

3) IPSec Gateway. Navigate to Network > Network Profiles> IKE Gateway

Specify the same pre-shared key used in Cisco firewall, in this example it is cisco

 

4) Tunnel Interface: Navigate to Network > Interfaces > Tunnel

Considering that you already created a separate zone for IPSec traffic and named as IPSec-tunnel.

 

5) IPSec Tunnel: Navigate to Network > IPSec Tunnels

 

6) Security Policy. Navigate to Policies > Security

 

7) Virtual Router. Navigate to Network > Virtual Routers

To configure route, choose the Virtual Router specified in Step 4, in this example its default virtual router.

 

8) IKE Outside Interface. Navigate to Policies > Security

Finally, you need to open IKE (port 500) on outside interface for peer IP to establish IPSec Tunnel.



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