Today, I would like to tell you how to build a site-to-site VPN from Sophos XG firewall to Azure, if you have no budget to buy a hardware base firewall for your home office or lab, no worry, you also can download and install at Microsoft Hyper-V (or others) Virtual Machine and it’s free!!

Let’s follow step by step to build site-to-site VPN from Sophos XG firewall to Azure.

Settings in Microsoft Azure Site

  1. Logon to Azure portal and select Virtual networks.

  2. On the Virtual networks page, click Create virtual network.

  3. Enter information as follow and click Create.

    Name: AZURE-LAB-VNet1

    Address Space: 10.10.0.0/16

    Subscription: select your subscription

    Resource group: select Create new and enter your Resource Group name

    Location: Select Central US (you also can choice other locations)

    Subnet Name: enter your subnet name

    Address range: 10.10.0.0/19

    DDoS protection: Basic (Default)

    Service endpoints: Disable (default)

  4. On the AZURE-LAB-Vnet1 page, select Subnets.

  5. On the AZURE-LAB-VNet1 – Subnets page, click +Gateway subnet.

  6. Enter Address range as 10.10.32.0/27 and click OK.

  7. Go back to Azure Dashboard and click +Create a resource.

  8. On the search bar, enter Virtual network gateway.

  9. Select Virtual network gateway and click Create.

  10. Enter information as follow and click Create.

    Name: AZURE-LAB-GW

    Gateway type: VPN

    VPN type: Route-based

    SKU: Basic

    Virtual network: Azure-Lab-VNet1

    Public IP address: Create new, enter AZURE-LAB-GWIP as its name, Basic for SKU and then click OK.

    Subscription: select your subscription

    Location: select the location as before (Central US) and then click Create.

  11. Go back to Azure Dashboard and click +Create a resource.

  12. On the search bar, enter Local network gateway.

  13. Select Local network gateway and click Create.

  14. Enter information as follow and click Create.

    Name: Cary-HQ

    IP Address: 184.65.174.148

    Subscription: select your subscription.

    Resource Group: click Use Existing and select AZURE-LAB

    Location: select the same location as before (Central US) and then click Create.

  15. On the Cary-HQ page select Connections.

  16. On the Cary-HQ – Connections page, click +Add.

  17. Enter information as follow and then click OK.

    Name: AZURE-LAB-VNet1toCaryHQ

    Virtual network gateway: AZURE-LAB-GW

    Local network gateway: Cary-HQ

    Shared key: enter your share, it is must the same as XG firewall site.

Settings On-premises Site

  1. We are using Sophos XG firewall behind NAT device, so we need to do port forward settings at NAT Device.


  2. Login to Sophos XG firewall.


  3. Select Network and make sure interfaces settings are correct.


  4. Select VPN and click Add, it’s under IPsec Connections.


  5. Enter information as follow and click Save.

    Name: GAM2Azure

    IP Version: IPv4

    Connection Type: Site-to-Site

    Gateway Type: Respond Only

    Policy: Microsoft Azure

    Authentication Type: select Preshared Key and type preshared key, it’s must be the same as Azure site.

    Listening Interface: Port2 – 102.168.0.127

    Local ID Type: IP Address

    Local ID: 184.65.174.148

    Local Subnet: LAN (172.16.1.0/24)

    Gateway Address: 52.176.45.61

    Remote ID Type: IP Address

    Remote ID: 52.176.45.61

    Remote Subnet: AZUREVNet (10.10.0.0/16)


  6. On the VPN page, the Active and Connection status should show green.


  7. On the Azure Connection page, the status should show Connected.


  8. You may find there is no traffic at VPN tunnel even their status show connected. No worry, that’s because we still not configure firewall rules yet.
  9. On the Sophos XG Firewall configure web page, select Firewall and click Add Firewall Rule.


  10. Enter follow information to create Inbound VPN rule and click Save.

    Rule Name: Inbound_VPN

    Action: Accept

    Source Zones: VPN

    Source Networks and Devices: Any

    Destination Zones: LAN

    Destination Networks: Any

    Services: Any


  11. Enter follow information to create Outbound VPN rule and click Save.

    Rule Name: Outbound_VPN

    Action: Accept

    Source Zones: LAN

    Source Networks and Devices: Any

    Destination Zones: VPN

    Destination Networks: Any

    Services: Any


    Now, we have Site-to-site VPN successfully.

    Hope you enjoy this post!!

    Cary Sun @SifuSun

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