MULTI-SITE VPN

Hi All,

I have a new client where client has 3 locations.

HEAD OFFICE has Sonicwall TZ 470 Model.

Branch 1 - Sangfor 1050

Branch 2 - Sangfor 1050

All the infrastructure is at Head office , ERP, File server , NAS etc from the headoffice we need to connect both the branches to create VPN tunnel for users to access everything in head office from both the branches.

Please give me a step by step guide on how to do it or if any has these type of scenerio it working smoonthly or are there any challenges in the connection.

Thanks.

Hi, i suggest you to configure a site-to-site for each remote office to hq. I attach here how to set up ipsec vpn.

To set up the multi-site VPN, configure the SonicWall TZ 470 at the Head Office as the central VPN hub and the Sangfor 1050 devices at both branches as VPN clients. Establish site-to-site VPN tunnels from each branch to the Head Office. Proper routing and firewall rules are in place for traffic between branches and the Head Office. Common challenges may include VPN stability, interoperability between SonicWall and Sangfor devices, and handling bandwidth limits for heavy usage.

Hi
Step-by-Step Guide to Setting Up the VPN Tunnel
1. Prepare Your Devices
Ensure all firmware is up to date on SonicWall and Sangfor devices.
Document IP addresses and subnet masks for all locations.
2. Configure SonicWall TZ 470 (Head Office)
Login to the SonicWall management interface.
Navigate to VPN > Settings.
Click on Add to create a new VPN policy.
Policy Type: Site-to-Site.
Authentication Method: IKE using Preshared Secret.
Name: Give a name (e.g., Branch1_VPN).
IPsec Primary Gateway Name or Address: Enter the public IP address of Branch 1's Sangfor 1050.
Local Networks: Specify the local network(s) you want to make accessible.
Remote Networks: Enter the subnet of Branch 1.
Under Advanced, configure the IKE settings (encryption and hashing algorithms).
Click OK to save.
3. Configure Sangfor 1050 (Branch 1)
Login to the Sangfor management interface.
Navigate to VPN > IPsec VPN.
Click on Add to create a new VPN tunnel.
Name: Give a name (e.g., HeadOffice_VPN).
Remote Gateway: Enter the public IP of the SonicWall.
Local Network: Define the local subnet of the branch.
Remote Network: Specify the head office subnet.
Use the same preshared key and IKE settings as on the SonicWall.
Save the configuration.
4. Repeat for Branch 2
Follow the same steps for Branch 2, ensuring you configure the tunnel to point to the head office SonicWall.
5. Testing the VPN Connection
After configuration, verify the status of the VPN tunnels on both SonicWall and Sangfor interfaces.
Use ping tests from branch devices to access resources in the head office.
6. Routing Configuration
Ensure that proper routing is set up. The SonicWall should route traffic destined for Branch 1 and Branch 2 through the respective tunnels.
On Sangfor, ensure that the routing table allows traffic to the head office subnet.
7. Firewall Rules
On the SonicWall, configure firewall rules to allow traffic from the branches to the head office resources.
Similarly, set rules on the Sangfor devices to allow traffic to the head office.
8. Monitoring and Maintenance
Regularly check the VPN status and logs for any errors or connectivity issues.
Ensure the systems are backed up and configuration changes are documented.
Potential Challenges
IP Address Conflicts: Ensure that there are no overlapping subnets between the head office and branches.
Firewall Rules: Misconfigured firewall rules can block traffic, so double-check that rules allow the necessary traffic.
NAT Issues: If NAT is enabled on either device, ensure that it is configured correctly to avoid translation issues.
ISP Issues: Occasionally, ISPs may block certain VPN protocols; ensure that the ports used by IPsec are open.