you have options for linking Azure virtual networks 1.Vnet-Vnet VPN In this scenario we create a VPN gateway on each venetto provide a secure tunnel with IPsec/IKE,before creating the VPN gateway, need to make sure that a VPN gateway subnet is ceared in each vnet 2.Vnet Perring Traffic between virtual machines in peer virtual networks is routed directly from the Microsoft backbone infrastructure, rather than via a gateway or the public Internet.