In this article I am going to walk you through setting up a site-to-site VPN between Azure and AWS. Provisionally this has always been a pain as AWS never supported IKEv2. In February of 2019 AWS changed this. Before you had to use a 3rd party network virtual appliance (NVA) either on Azure or AWS to establish the VPN.
Information
At the time of writing this article BGP is not supported
Lets get to it
I am going to assume you already have an Azure VPN created and also an AWS VPN created.
In AWS navigate to the VPC you want to connect to Azure and create a new Customer Gateways. Enter a Name and the Public IP Address of you Azure Virtual Network Gateway. Then click Create Customer Gateway.
To read the full article have a look at my blog. https://pixelrobots.co.uk/2019/03/create-a-site-to-site-vpn-between-existing-azure-and-aws-resources...