I think you are overestimating the resilience of TCP, yes it will probably eventually renegotiate, but you create a horrible user experience. Have a read of so

I think you are overestimating the resilience of TCP, yes it will probably eventually renegotiate, but you create a horrible user experience. Have a read of some of the cloudflare engineering blogs, they give some sense of the technical challenges of deploying anycast. I wouldnt recommend a company deploy connection based anycast services, unless they are prepared to spend a lot on the engineering challenges. > Since packets will follow the shortest path, if a particular path is withdrawn then packets will find their way to the next shortest available route. For simple protocols like UDP that don't maintain state, Anycast is ideal and it has been used widely to load balance DNS for some time. At CloudFlare, we've done a significant amount of engineering to allow TCP to run across Anycast without flapping. This involves carefully adjusting routes in order to get optimal routing and also adjusting the way we handle protocol negotiation itself. While more complex to maintain than a Unicast network, the benefit is we can lose an entire data center and packets flow to the next closest facility without anyone noticing and hiccup. https://blog.cloudflare.com/cloudflares-architecture-eliminating-single-p/ https://blog.cloudflare.com/cloudflares-architecture-elimina... > WARP was experiencing so many failures because devices were switching servers much more often than we expected. If you recall, our ECMP router configuration uses a combination of (Source IP, Source Port, Destination IP, Destination Port) to match a packet to a server. Destination IP doesn’t generally change, WARP clients are always connecting to the same Anycast addresses. Similarly, Destination Port doesn’t change, we always listen on the same port for WARP traffic. The other two values, Source IP and Source Port, were changing much more frequently than we had planned. https://blog.cloudflare.com/warp-technical-challenges/ https://blog.cloudflare.com/warp-technical-challenges/