Expert knowledge for Azure VPN Gateway development including troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when configuring S2S/P2S tunnels, IPsec/IKE/BGP, Entra/RADIUS auth, active-active gateways, or S2S over ExpressRoute, and other Azure VPN Gateway related development tasks. Not for Azure ExpressRoute (use azure-expressroute), Azure Virtual WAN (use azure-virtual-wan), Azure Virtual Network (use azure-virtual-network), Azure Virtual Network Manager (use azure-virtual-network-manager).