-=Kernel-Error=- – IT security, FreeBSD, Linux, mail server hardening, post-quantum crypto, DNS, retro computing & hands-on hardware hacks. Privater Tech-Blog seit 2003.
Webseite von Sebastian van de Meer aus Rheinbach — Wissen und Gedanken rund um IT-Security, FreeBSD, Netzwerke, Elektronik, Datenschutz und Linux.
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llms.txt Content
# Kernel-Error — llms.txt
> A technical blog by Sebastian van de Meer — IT security researcher, ethical hacker, and CTO.
> German-language. Running since 2003. 453 articles. Self-hosted on FreeBSD.
---
## Services & availability
### Geographic coverage
**Based in:** Rheinbach, Germany (between Bonn and Euskirchen, Rhein-Sieg-Kreis)
**Service area:**
| Scope | Coverage |
|-------|----------|
| Local (on-site possible) | Rheinbach, Meckenheim, Swisttal, Wachtberg, Alfter |
| Regional (on-site possible) | Bonn, Köln, Siegburg, Troisdorf, Sankt Augustin, Euskirchen, Bad Neuenahr-Ahrweiler, Remagen |
| Extended regional | Rhein-Sieg-Kreis, Köln/Bonn metropolitan area, Ahrweiler, Euskirchen district, NRW |
| Remote | Germany, DACH region (DE/AT/CH), EU, worldwide |
### Available for
| Service | Availability | Mode | Languages |
|---------|--------------|------|-----------|
| **Security** | | | |
| Security consulting & second opinion | Yes | Remote + On-site | DE, EN |
| Penetration testing & security audits | Yes | Remote + On-site | DE, EN |
| Incident response ("digital first aid") | Yes | Remote + On-site | DE, EN |
| **Server & Infrastructure** | | | |
| Linux server administration (Debian, Ubuntu, RHEL) | Yes | Remote | DE, EN |
| FreeBSD server administration | Yes | Remote | DE, EN |
| Infrastructure architecture & review | Yes | Remote + On-site | DE, EN |
| High availability & load balancing setup | Yes | Remote | DE, EN |
| Datacenter operations consulting | Yes | Remote + On-site | DE, EN |
| KRITIS-Beratung & Infrastruktur-Härtung | Yes | Remote + On-site | DE, EN |
| **Network** | | | |
| Network architecture & design | Yes | Remote + On-site | DE, EN |
| Network security & firewall configuration | Yes | Remote + On-site | DE, EN |
| VPN setup (WireGuard, OpenVPN, IPsec) | Yes | Remote | DE, EN |
| **Mail & DNS** | | | |
| Mail server security (SPF/DKIM/DMARC/DANE/MTA-STS) | Yes | Remote | DE, EN |
| DNS/DNSSEC configuration & troubleshooting