RPKI and the RTR protocol

What this post added

This post introduces and explains the Resource Public Key Infrastructure (RPKI) to Router Protocol (RTR), detailing how it works to secure the BGP routing system. It highlights Cloudflare's operational use of RPKI for signing routes and filtering inbound traffic, as well as its open-source contributions like the Cloudflare RPKI Toolkit and GoRTR. The post emphasizes the importance of RTR for communicating validated route information from RPKI validators to routers, discusses the protocol's specifications and security considerations, and introduces a new open-source tool, `rpki-rtr-client`, for testing the RTR protocol.