Azure Redundant Tunnels - Virtual network gateway

Introduction

This guide will help you understand how to establish redundant tunnels between your Harmony SASE network and your Azure Virtual Network Gateway. Redundant tunnels ensure continuous network connectivity even if one of the connections is interrupted.

Breakdown of topics

1. Pre-requisites
2. Configuration Steps
3. Verifying the Setup
4. Troubleshooting
5. Support Contacts

Pre-requisites

To successfully follow this guide, you should have:

1. An active Harmony SASE account and network.
2. The Harmony SASE app is installed on your devices.
3. An active Azure account with admin permissions.

Create Harmony SASE  Gateways

1. Your Harmony SASE Network will need to have at least two different gateways in the same network, as listed below.
   
2. Write down the Public IPs for both GWs. Those IPs will be used for the local network gateways on Azure.

Create a Virtual network gateway on Azure

1. In your Azure Portal under Virtual network gateways, click on +Create
   
   • Provide the Gateway with a meaningful name.
   • Select the relevant Region.
     
   • Gateway type - VPN
     
   • VPN Type - Route-Based
     
   • SKU - Based on your preference and requirements
     
   • Virtual network - Select the relevant VNET
     
   • Gateway subnet address range - (If not filled automatically) Type the address range that was reserved for your Azure gateway (More information can be found in our Single Tunnel guide)
   • Public IP address - create new or select existing 
   • Enable active-active mode - Enabled
     
   • Second Public IP Address -  create new or select existing 
     
   • Configure GBP - Enabled
     
   • ASN - Leave default or configure based on your preference
     
   • Custom Azure APIPA BGP IP address - leave empty

Create Local network gateways

Next, you will need to create two Local Network Gateways, one for each of your Harmony SASE Gateways:

1. In your Azure Portal under Local network gateways, Click on +Create.
   
2. Fill in the following information on the Basic tab.
   • Select the relevant resource group.
   • Select the relevant Region.
   • Provide the Gateway with a meaningful name.
   • Endpoint - IP Address.
   • IP Address - Type in the Public IP provided in the Harmony SASE web application
   • Address Space - Fill in your Permieter81 Address space.
     
3. Fill in the following information in the Advanced tab:
   • Configure BGP settings - Yes
   • ASN - can you the default or choose one from the permitted range
     
   • BGP peer IP address - Type any address from the permitted range
     
4. Repeat steps 1-3 for the second Perimtere81 Gateway as well.

Create a connection

1. Go to your Local network gateway and click on connections. Press +Add.
   
2. Fill in the following information:
   • Name: Enter a meaningful name
   • Virtual Private Gateway: Select the Virtual Private Gateway created in the first step of this guide
   • Local network gateway: No need to modify (locked)
   • Shared key (PSK): Generate a key on the Harmony SASE side, or on a different PSK generating application. 
     • The key may only contain numbers, letters, and the following characters: “_” and “.”
   • Use Azure Private IP Address: leave unchecked
   • Enable BGP: Check
   • IKE Protocol: IKEv2
   • Press OK
     
3. Open the connection you just created and select configuration
4. Under IPsec / IKE policy, choose Custom and use the following values to align with the values set in the Harmony SASE's tunnel settings:

   Encyrption: AES256
   Integrity/PRF: SHA1
   DH Group: DHGroup2

   IPsec Encryption: AES256
   IPsec Integrity: SHA1
   PFS Group: PFS2

   IPsec SA lifetime in KiloBytes: 102400000
   IPsec SA lifetime in seconds: 27000

   
   

   

   
   
5. Create an additional connection for the second Local network gateway
6. Download the tunnel configurations (for both Connections):
   • Access your Virtual network gateway -> Settings -> Connections -> Click on your 1st connection
     
   • Click on Download configurations
   • Device vendor: Generic Samples; Device family: Device Parameters; Firmware version: 1.0
   • Download configuration
     

Creating the High Availability Harmony SASE Tunnel

1. On Your Harmony SASE Admin console, Navigate to your network.
2. Click "..." next to one of the gateways and select Add Tunnel.
3. Select Redundant Tunnels.
   
4. Select a logical name for your tunnel, 
   • For example, if your V-Net is located in the EU-West region of Azure, you could name the tunnel "EUWest". 
5. Copy the values for the first tunnel from untitled file.txt:
   • Shared Secret: Pre-Shared Key
     Harmony SASE gateway Internal IP: Inside IP Addresses of Customer Gateway
   • Remote Public IP & Remote ID: Outside IP Addresses of Virtual Private Gateway
     Remote Gateway internal IP: Inside IP Addresses of Virtual Private Gateway
   • Remote Gateway ASN: BGP Configuration Options of Virtual Private Gateway ASN from file
     
   • In Harmony SASE, your Tunnel page should look like this:
     
6. Repeat step 5 for the second Tunnel, this time using the values from untitled file(1).txt.
7. Under Shared Settings, you'll want to make sure to select Any(0.0.0.0/0) for both sides. ASN number should remain the same for the Harmony SASE side.
   
8. Under Advanced Settings match the following (unless you have configured customer settings on the Azure side):
   
9.  Click Add Tunnel.

Creating Static Routes

1. Navigate to your Harmony SASE network and add the route to the corresponding subnet in Azure.
2. You'll want to select "..." next to your network and then Routes Table.
   
3. Once that has been completed be sure to select "Apply Configuration" and let the route changes propagate on the Harmony SASE side.
   

Verifying the Setup

Once set up, your redundant tunnels should be active. To confirm, go to your Harmony SASE dashboard, find the tunnels you started, and ensure their status shows "Up". Connect to your network with the Harmony SASE agent and try accessing resources in your Azure environment.

Troubleshooting

If you encounter issues during or after the setup, try reviewing your settings to ensure everything matches the instructions. In particular, check the IP addresses and other details you entered during setup. If issues persist, please consult our dedicated support.

Support Contacts

If you have any difficulties or questions, don't hesitate to contact Harmony SASE's support team. We offer 24/7 chat support on our website at Perimeter81.com, or you can email us at support@perimeter81.com. We're here to assist you and ensure your VPN tunnel setup is a success.