Example: Configure an IPsec VPN Between a vSRX Virtual Firewall and Virtual Network Gateway in Microsoft Azure
This example shows how to configure an IPsec VPN between a vSRX Virtual Firewall instance and a virtual network gateway in Microsoft Azure.
Before You Begin
Ensure that you have installed and launched a vSRX Virtual Firewall instance in Microsoft Azure virtual network.
See SRX Site-to-Site VPN Configuration Generator and How to troubleshoot a VPN tunnel that is down or not active for additional information.
Overview
You can use an IPsec VPN to secure traffic between two VNETs in Microsoft Azure, with one vSRX Virtual Firewall protecting one VNet and the Azure virtual network gateway protecting the other VNet.
vSRX Virtual Firewall IPsec VPN Configuration
Procedure
Step-by-Step Procedure
To configure IPsec VPN on vSRX Virtual Firewall:
Log in to the vSRX Virtual Firewall in configuration edit mode (see Configure vSRX Using the CLI).
Set the IP addresses for vSRX Virtual Firewall interfaces.
set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.10/24 set interfaces ge-0/0/1 unit 0 family inet address 10.10.10.10/24 set interfaces st0 unit 1 family inet address 10.0.250.10/24
Set up the untrust security zone.
set security zones security-zone untrust screen untrust-screen set security zones security-zone untrust host-inbound-traffic system-services ike set security zones security-zone untrust interfaces ge-0/0/0.0 set security zones security-zone untrust interfaces st0.1
Set up the trust security zone.
set security zone trust host-inbound-traffic system-services https set security zone trust host-inbound-traffic system-services ssh set security zone trust host-inbound-traffic system-services ping set security security-zone trust interfaces ge-0/0/1.0
Configure IKE.
set security ike proposal ike-phase1-proposalA authentication-method pre-shared-keys set security ike proposal ike-phase1-proposalA dh-group group2 set security ike proposal ike-phase1-proposalA authentication-algorithm sha-256 set security ike proposal ike-phase1-proposalA encryption-algorithm aes-256-cbc set security ike policy ike-phase1-policyA mode main set security ike policy ike-phase1-policyA proposals ike-phase1-proposalA set security ike policy ike-phase1-policyA pre-shared-key ascii-text <preshared-key> set security ike gateway gw-siteB ike-policy ike-phase1-policyA set security ike gateway gw-siteB address 52.175.210.65 set security ike gateway gw-siteB version v2-only set security ike gateway gw-siteB external-interface ge-0/0/0.0
Note:Be sure to replace
52.175.210.65in this example with the correct public IP address.Configure IPsec.
The following example illustrates a vSRX Virtual Firewall IPsec configuration using the CBC encryption algorithm:
set security ipsec proposal ipsec-proposalA protocol esp set security ipsec proposal ipsec-proposalA authentication-algorithm hmac-sha1-96 set security ipsec proposal ipsec-proposalA encryption-algorithm aes-256-cbc set security ipsec proposal ipsec-proposalA lifetime-seconds 7200 set security ipsec proposal ipsec-proposalA lifetime-kilobytes 102400000 set security ipsec policy ike-phase1-policyA proposals ipsec-proposalA set security ipsec vpn ike-vpn-siteB bind-interface st0.1 set security ipsec vpn ike-vpn-siteB ike gateway gw-siteB set security ipsec vpn ike-vpn-siteB ike ipsec-policy ike-phase1-policyA set security ipsec vpn ike-vpn-siteB establish-tunnels immediately
If required, you can use AES-GCM as the encryption algorithm in the vSRX Virtual Firewall IPsec configuration instead of CBC:
set security ipsec proposal ipsec-proposalA protocol esp set security ipsec proposal ipsec-proposalA encryption-algorithm aes-256-gcm set security ipsec proposal ipsec-proposalA lifetime-seconds 7200 set security ipsec proposal ipsec-proposalA lifetime-kilobytes 102400000 set security ipsec policy ike-phase1-policyA proposals ipsec-proposalA set security ipsec vpn ike-vpn-siteB bind-interface st0.1 set security ipsec vpn ike-vpn-siteB ike gateway gw-siteB set security ipsec vpn ike-vpn-siteB ike ipsec-policy ike-phase1-policyA set security ipsec vpn ike-vpn-siteB establish-tunnels immediately
Configure routing.
set routing-instances siteA-vr1 instance-type virtual-router set routing-instances siteA-vr1 interface ge-0/0/0.0 set routing-instances siteA-vr1 interface ge-0/0/1.0 set routing-instances siteA-vr1 interface st0.1 set routing-instances siteA-vr1 routing-options static route 0.0.0.0/0 next-hop 10.0.0.1 set routing-instances siteA-vr1 routing-options static route 10.20.20.0/24 next-hop st0.1 commit
Microsoft Azure Virtual Network Gateway Configuration
Procedure
Step-by-Step Procedure
To configure the Microsoft Azure virtual network gateway, refer to the following Microsoft Azure procedure:
Configure IPsec/IKE policy for S2S VPN or VNet-to-VNet connections
Ensure the IPSec IKE parameters in Microsoft Azure virtual network gateway match the vSRX Virtual Firewall IPSec IKE parameters when the site-to-site VPN connection is formed.
Verify Active VPN Tunnels.
Verify that the tunnel is up between the vSRX Virtual Firewall instance and the Azure virtual network gateway.
root@> show security ike security-associations
Index State Initiator cookie Responder cookie Mode Remote Address 8290401 UP b1adf15fc3dfe0b0 89cc2a12cb7e3cd7 IKEv2 52.175.210.65
root@> show security ipsec security-associations
Total active tunnels: 1 ID Algorithm SPI Life:sec/kb Mon lsys Port Gateway <131073 ESP:aes-gcm-256/None c0e154e2 5567/ 102399997 - root 4500 52.175.210.65 >131073 ESP:aes-gcm-256/None 383bd606 5567/ 102399997 - root 4500 52.175.210.65