VPC peering recommendations

When you require VPC peering, always consider the IP addressing of the existing VPCs so that you don't create an environment with overlapping IPs – VPC peering connections will not support overlapping IP ranges. Make sure that you always keep a design in mind that will allow you to grow. A good approach is to build sequential network ranges, for example, 10.0.0.0/16, 10.1.0.0/16, and 10.2.0.0/16 for the VPC networks, and then divide those networks into subnets, for example, 10.0.1.0/24, 10.0.2.0/24, 10.1.1.0/24, and 10.1.2.0/24. None of these ranges will ever overlap.