This blog post discusses Ably's journey in building the next iteration of their global network and the design decisions they faced. The company operates a global network spanning 8 AWS regions with hundreds of additional points-of-presences, providing unrivaled realtime messaging and data streaming performance, availability, and reliability. They decided to use VPC peering instead of Transit Gateway due to its cost-effectiveness and scalability. Multi-account support was achieved by creating a prod and nonprod VPC per region, with 3 public and private subnets per VPC each in a different availability zone. The company also chose to purchase a block of IPv6 space and will provision all VPCs and subnets as dual stack for easier routing between regions.