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My recollection is that for a period of time, as a part of the internal “Move to AWS” (MAWS) campaign, the entire retail business ran within a single VPC. A lot has changed!

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That's crazy. That would never work unless these are just a VLAN configured on existing switches. Even VXLAN wouldn't be able to do that 5 years ago.

AWS developed their own custom overlay networking system. It embeds tenant IDs into the packets for isolation

Running out of IP addresses within that VPC is a real difficulty for services still using it.

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