You need direct connectivity from an on-premises network to SAP HANA (Large Instances). The solution must meet the following requirements: Minimize…

Azure ExpressRoute is the designated service for establishing a private, dedicated, and high-throughput connection between an on-premises network and Microsoft Azure. For SAP HANA on Azure (Large Instances), ExpressRoute is the mandatory connectivity method. It is engineered for high resiliency by providing redundant connections. As a managed service, it simplifies the setup and maintenance of a private link compared to other methods, thus minimizing administrative effort while meeting the high availability requirements for mission-critical SAP workloads.

A. ExpressRoute Global Reach: This is an add-on feature for connecting two or more separate on-premises networks to each other over the Microsoft global backbone, not for the primary connection from a single on-premises site to Azure.

B. Linux IPTables: This is a host-based firewall utility within a Linux operating system. It manages packet filtering on a single machine and is not a solution for establishing network connectivity between a datacenter and Azure.

D. NGINX as a reverse proxy: This is an application-layer (Layer 7) service used for load balancing and directing HTTP/S traffic. It does not provide the underlying network-layer (Layer 3) connectivity required between on-premises and Azure.

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1. Microsoft Docs

"SAP HANA on Azure (Large Instances) overview and architecture": Under the "Network architecture" section

it explicitly states

"The network architecture for SAP HANA on Azure (Large Instances) is a key component... The solution is to use Azure ExpressRoute... An ExpressRoute circuit is required to connect from on-premises to the SAP HANA Large Instance stamp." This confirms ExpressRoute is the required technology.

2. Microsoft Docs

"What is Azure ExpressRoute?": In the "Features" and "Benefits" sections

it highlights that ExpressRoute provides a "private connection

" "higher reliability

" and "redundancy in every peering location." This supports the requirements for resiliency and a direct connection.

3. Microsoft Docs

"Designing for high availability with ExpressRoute": This document details the architecture for resiliency

stating

"An ExpressRoute circuit is composed of two connections to two Microsoft Enterprise Edge (MSEE) routers... By default

ExpressRoute circuits are designed for high availability." This directly addresses the "highest level of resiliency" requirement.

4. Microsoft Docs

"ExpressRoute Global Reach": The overview section clarifies its purpose: "You can use ExpressRoute Global Reach to link ExpressRoute circuits together to build a private network between your on-premises networks." This confirms it is for on-premises-to-on-premises connectivity

making it incorrect for the scenario.