Manage overlapping subnet (different VPC) on same TGW
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Hi all, its' possible to manage overlapping subnet (different VPC) on same TGW? Below an example of network project.
Tnx
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Not supported, See the TransitGateway FAQ
Q: Can I connect Amazon VPCs with overlapping CIDRs?
A: Amazon Transit Gateway doesn’t support routing between Amazon VPCs with overlapping CIDRs. If you attach a new Amazon VPC that has a CIDR which overlaps with an already attached Amazon VPC, Amazon Transit Gateway will not propagate the new Amazon VPC route into the Amazon Transit Gateway route table.
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