Cisco ASA Route-based Site-to-Site VPN to Azure

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prerequirements: ASA software 9.8.1 (I have tested 9.8.2)

Azure configuration:
add a Virtual network gateway to you azure subnet, I use basic, then adding a connection to the gateway like this:


ASA configuration

Configure VPN interface:

crypto ikev2 policy 3
encryption aes-256
integrity sha
group 2
prf sha
lifetime seconds 10800


crypto ipsec ikev2 ipsec-proposal Proposal-Azure
  protocol esp encryption aes-256
  protocol esp integrity sha-1


crypto ipsec profile Profile-Azure
  set ikev2 ipsec-proposal Proposal-Azure
  set pfs group2
  set security-association lifetime kilobytes 102400000
  set security-association lifetime seconds 10800


interface Tunnel1
  nameif VPN-AZURE
  ip address 169.254.2.1 255.255.255.0 standby 169.254.2.2
  tunnel source interface outside
  tunnel destination [Azure vpngateway public ip]
  tunnel mode ipsec ipv4
  tunnel protection ipsec profile Profile-Azure


tunnel-group [Azure vpngateway public ip] type ipsec-l2l
tunnel-group [Azure vpngateway public ip] ipsec-attributes
ikev2 remote-authentication pre-shared-key [PreesharedKey]
ikev2 local-authentication pre-shared-key [PreesharedKey]

Configure static route to azure networks:

route VPN-AZURE [local azure subnet scope] 255.255.255.0 [Azure vpngateway public ip] 1

 

Source:
https://supportforums.cisco.com/t5/vpn/route-based-vpn-vti-for-asa-finally-here/td-p/3046928

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