Site to Site VPN in AWS

• Site to Site VPN Connection is established as shown below
  
• VPN server onpremises is referred as Customer gateway and in VPC we create a VPN Gateway
• Between customer gateway and vpn gateway we configure ipsec tunnel
• Configure route tables in vpc to forward traffic to vpn gateway for on-premise ip range and do the same in on-premises network by configuring routers
• For screenshots watch classroom recording
• Refer Here for further docs

Site to Site VPN in Azure

• Refer Here for docs
  

Multi site to site vpn

• My organization has 5 on-prem datacenters and 5 cloud networks
• On a broader note we have two topologies
  • hub and spoke
  • full mesh
• AWS Transit Gateway
• Azure virtual WAN
• To make this connections centralized, AWS has launched AWS Network Manager and Azure has Azure Network Manager