https://docs.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-howto-point-to-site-resource-manager-portal
Configure a Point-to-Site connection to a VNet using native Azure certificate authentication: Azure portal
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Daily Archives: January 20, 2018
Connecting the Home Lab to Azure on the Cheap
http://www.jandjnet.com/connecting-the-home-lab-to-azure-on-the-cheap-6/
ON-PREMISES SITE 2 SITE VPN WITH AZURE USING TOMATO SHIBBY MOD (ENTWARE-NG AND STRONGSWAN SETUP) – PART 1
Step-By-Step: Configuring a site-to-site VPN Gateway between Azure and On-Premise
https://blogs.technet.microsoft.com/canitpro/2017/06/28/step-by-step-configuring-a-site-to-site-vpn-gateway-between-azure-and-on-premise/
Site-To-Site Routed VPN Between Two or More Routers using dd-wrt/openvpn
http://wadihzaatar.com/?p=11