Running Your Own AS: An IXP over VXLAN, IPv4 on the Overlay, and a Config Spring Clean

Table of Contents Table of Contents At a Glance Architecture: Where Everything Sits Now EVIX: An Exchange Point With No Port What EVIX Actually Is VXLAN on FreeBSD PF for a Tunnelled Peering LAN FRR: Two Route Servers, Two ASNs Where EVIX Sits in the Local-Preference Hierarchy IPv4 Arrives, Sideways The Situation Carrying the Block Across the Overlay The Asymmetry Problem What This Buys The Far End: Dual-FIB Routing on radon Two Routing Tables, One Interface Each FIB 1 Needs a Complete Map Three Kinds of Jail reply-to on Every Tunnel Ingress Rule The Two Extras Downstream: WireGuard for the Home Router The Spring Clean One Table for Every BGP Peer Deprecating the Transit Addresses Prefix Lists, Interface Routes, and Daemons Monitoring: Fourteen Sessions on One Screen Lessons Learned Conclusion References Part 1 set up a single FreeBSD BGP router with two upstreams. Part 2 added a Vultr edge and iBGP. Part 3 joined LocIX Düsseldorf with a dedicated third edge. Part 4 added a fourth…