AWS how connect two VPC in same account but overlapping CIDR

Question

Right now I have a VPC where my RDS in a private subnet, also I have a ECS in the same VPC and both have communication, now the problem is, I have a new ECS but in another VPC, first I tried to do a VPC peering, but both VPC have the CIDR overlapping. What can I do?

I expect to have a solution for my problem

I think AWS PrivateLink or a self build NAT-ing solution are possibilities. See aws.amazon.com/blogs/networking-and-content-delivery/… Dependent on what kind of services you want to connect you might also have a look at Amazon VPC Lattice aws.amazon.com/vpc/lattice — Korgen
– Korgen, Commented Jun 12, 2024 at 15:07

user25491705 · Accepted Answer · 2024-06-12 19:57:21Z

0

You can't peer overlapping VPCs. You can create attachments to a Transit Gateway for overlapping VPCs, BUT it will not let you propagate two identical CIDRs, and only the first route is propagated so it's not routable.

The easiest way around this (without faffing with S2S VPNS + NATs or AWS Private NAT GW + TGW) is using AWS Private Link. It is useful for Producer/Consumer architectures and is compatible with over-lapping CIDRs as it uses VPC Endpoints.

Here is more info: https://docs.aws.amazon.com/vpc/latest/privatelink/create-endpoint-service.html

answered Jun 12, 2024 at 19:57

user25491705

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