// BGP
BGP
Route Leaks
RPKI
ASPA
PeerCortex
Internet Infrastructure
Network Security
Routing Security
RFC 9234
NANOG
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
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2026-05-29
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~2 min read min read
BGP
Communities
Networking
RTBH
RFC 8092
Internet Infrastructure
Network Engineering
Routing Policy
IXP
Peering
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
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2026-05-27
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~2 min read min read
ADHD Diary
BGP
ASPA
RPKI
PeerCortex
Internet Infrastructure
Routing Security
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
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2026-04-07
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~3 min read min read
Networking
BGP
Security
RPKI
ASPA
Route Leaks
Internet Infrastructure
Routing Security
RFC 9234
Path Validation
BGPsec
We validated who is allowed to announce a prefix. We never validated how it gets there.
Rene Fichtmueller
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2026-04-05
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~2 min read min read
Open Source
Networking
BGP
RPKI
PeerCortex
ASPA
Network Intelligence
Internet Infrastructure
Routing Security
Health Check
Peering
70,000+ networks. 13 health checks. One tool that didn't exist — so I built it.
Rene Fichtmueller
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2026-04-05
/
~2 min read min read