AWS Peering in Brazil

I have servers in Sao Paulo, BR and Dallas, US.

I’m using a Load Balancer on CF with geo-steering and the server coordinates set up.

When an AWS EC2 machine in the Brazil AZ (Sao Paulo as well) tries to reach my site, it regularly ends up contacting the Dallas server 8000km away, not the one down the road in Sao Paulo.

Traceroutes to/from the AWS node and my servers show that the one in Brazil is much shorter and has much lower latency than the one in Texas, so I’d assume that the obvious route is also the optimal route that gets chosen thanks to Anycast. Yet it appears not so.

Do Amazon and Cloudflare only peer in certain locations so that traffic regularly has to take a detour?

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