Running Your Own AS: BGP on FreeBSD with FRR, GRE Tunnels, and Policy Routing
Summary
Long-form, hands-on guide to running an autonomous system with BGP on FreeBSD using FRR, GRE/GIF tunnels, and policy routing. The article details resource obtaining from RIPE via sponsoring LIR, FRR config, bridge ports, PF firewall rules, bogon filtering, and a sophisticated dual-FIB setup for interleaving traffic from BGP and provider addresses. It also discusses verification, MSS clamping, and traffic engineering with two upstreams for redundancy and performance.