Step 1: Create VPC Networking and VM for API and DB
Step 2: Create VPC network peering for both VPC Network
Step 3: Ping one server to another
Step 4: TCPDump
One Server
sudo apt install nginx
sudo tcpdump -i ens4 -v port 80
Another Server
telnet ...address 80
More Details: github.com/umarfchy/gcp-vpc-peering-and-ngi..