How to Build an Anycast Network
An anycast network is two or more servers advertising the same IP address from different locations. We can't make any assumptions about where traffic will originate, and we can minimize latency by routing requests to the server closest to the end-user that's capable of responding to the request. For static sites, we can rely on BGP to route requests to the server closest to the end-user; we advertise our IP from anycast servers worldwide, which inspect each request and forward it to a server capable of responding. If one of those servers fails, its peers will stop advertising the route and the traffic will be sent elsewhere. After getting your application running on the server, you can get started on configuring BGP. When we configured BGP, we first needed to submit an application to Vultr requesting that they enable BGP for our account. Your server will establish a peering session with Vultr's AS. At this point, your server is capable of transmitting packets with the rest of the internet. Your server can now serve traffic for your IP! Repeat these same steps with a second server in another region and you have your very own anycast network.