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Thanks. I was going through Cloudflare's Magic Transit docs and they seem to simply use Direct Server Return (Facebook does so too for their L4 load balancer [

Thanks. I was going through Cloudflare's Magic Transit docs and they seem to simply use Direct Server Return (Facebook does so too for their L4 load balancer [0] instead of dealing with XDP in the return path). Any reason fly.io doesn't but relays the packets again out via the edge? [0] https://engineering.fb.com/open-source/open-sourcing-katran-a-scalable-network-load-balancer/ https://engineering.fb.com/open-source/open-sourcing-katran-...

tptacek 6y ago
It's possible that we could; my concern is our forwarding takes over IP addressing, and can forward cross-region, and that theoretically direct server return could break RPF. DSR is, of course, much easier than the flow-based response forwarding we're doing now.