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How AWS Cloud WAN Simplifies Enterprise Multi-Region, Multi-Account Networking

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AWS Cloud WAN offers a global, policy-driven alternative to the traditional multi-region Transit Gateway architecture that becomes increasingly complex as enterprise networks scale. Unlike Transit Gateways, which require separate route tables and peering configurations across each region, Cloud WAN uses a single versioned JSON policy document to define routing segments, inspection rules, and attachments. The platform connects regional edges over AWS's own backbone, eliminating the need for manual inter-region peering and reducing double-hop firewall inspection to a single traversal. A network engineer who ran Cloud WAN in production across four regions and several hundred accounts describes how segments, attachments, and inspection VPCs are structured within the architecture. The post serves as a design reference for teams looking to consolidate routing intent and reduce operational overhead in large-scale AWS environments.

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How AWS Cloud WAN Simplifies Enterprise Multi-Region, Multi-Account Networking · ShortSingh