Your configuration is known as a "Hybrid Cloud."
1. You can use the "Express Route" connection if you use Microsoft Azure.

2. If you utilize AWS, you may use the "AWS Direct Connect" integrated functionality.
3. You may utilize "Google Dedicated Interconnect" if you use Google.

To connect your cloud servers to your office network using Sangfor, you can follow these general steps:

Set up a VPN tunnel: Configure a VPN tunnel between your Sangfor device (such as Sangfor VPN gateway or firewall) in your office and the cloud servers. This will establish a secure and private connection between the two networks.

Configure IP addressing: Assign appropriate IP addresses to the cloud servers and the interfaces on the Sangfor device that will connect to the cloud servers. Ensure that the IP addressing is consistent and does not overlap with any existing networks.

Create VPN policies: Create VPN policies on the Sangfor device that specify the source and destination IP addresses, as well as the required encryption and authentication settings. These policies will determine which traffic is allowed through the VPN tunnel.

Configure routing: Set up routing on the Sangfor device to direct the traffic destined for the cloud servers to the VPN tunnel. This can be done by adding specific routes for the cloud server IP addresses or by using routing protocols, such as OSPF or BGP, if supported by your Sangfor device and cloud servers.

Verify connectivity: Test the connectivity between the office network and the cloud servers. Ping the cloud server IP addresses from devices in the office network to ensure that the traffic is correctly routed through the VPN tunnel.

It's important to note that the specific configuration steps may vary depending on the Sangfor device and cloud platform you are using. It is recommended to consult the documentation and user guides provided by Sangfor for detailed instructions on setting up the VPN tunnel and configuring routing.

Additionally, if you are using a specific cloud platform (such as AWS, Azure, or Google Cloud), they often provide their own VPN gateway solutions and detailed documentation on how to establish connectivity between the cloud servers and your office network.

If you require more specific guidance, it is recommended to consult with Sangfor technical support or seek assistance from a qualified network administrator who is familiar with Sangfor products and the specific cloud platform you are using.

Ensure that there is proper network connectivity between the Sangfor IAM 5200 device and the external servers. Verify that the device can reach the IP addresses of the external servers by performing network connectivity tests such as ping or traceroute.

Configure a VPN tunnel between your Sangfor device (such as Sangfor VPN gateway or firewall) in your office and the cloud servers. This will establish a secure and private connection between the two networks.

Configure the routing on the office network to route traffic to the cloud server network through the VPN.