Internet Infrastructure

BGP Route Leaks RPKI ASPA PeerCortex Internet Infrastructure Network Security Routing Security RFC 9234 NANOG

Route Leaks in 2026: Still Happening, Still Causing Outages

BGP route leaks peaked in 2019 and never went away. RPKI validates origins. It doesn't validate paths. ASPA deployment is at 3% of ASNs. Here's what PeerCortex found checking 70,000 networks.

Rene Fichtmueller / 2026-05-29 / ~2 min read min read

BGP Communities Networking RTBH RFC 8092 Internet Infrastructure Network Engineering Routing Policy IXP Peering

BGP Communities: The Feature Everyone Ignores

BGP communities ship on every router. Most operators use three of them. Large communities, RFC 8092, selective announcement, RTBH signaling — the full feature set sits untouched in most networks.

Rene Fichtmueller / 2026-05-27 / ~2 min read min read

ADHD Diary BGP ASPA RPKI PeerCortex Internet Infrastructure Routing Security

ADHD Diary #004 — ASPA, a Bad Doctor's Day, and Why PeerCortex Has Had This for a While

Today was not a good day. Since my spinal disc surgery, nothing has been working the way it should. Today was the full doctors' marathon — from practice to practice,

Rene Fichtmueller / 2026-04-07 / ~3 min read min read

Networking BGP Security RPKI ASPA Route Leaks Internet Infrastructure Routing Security RFC 9234 Path Validation BGPsec

RPKI Didn't Fix Routing.

We validated who is allowed to announce a prefix. We never validated how it gets there.

Rene Fichtmueller / 2026-04-05 / ~2 min read min read

Open Source Networking BGP RPKI PeerCortex ASPA Network Intelligence Internet Infrastructure Routing Security Health Check Peering

PeerCortex: Why I Built a Network Intelligence Platform

70,000+ networks. 13 health checks. One tool that didn't exist — so I built it.

Rene Fichtmueller / 2026-04-05 / ~2 min read min read