Vom Hirn ins Terminal seit 1998

IT specialist system integration (Fachinformatiker Systemintegration) and work as Sr. Professional Consultant IT Network and Communication. Lived in the United States (New Hampshire) for about five years and moved back to Germany. Like to blog about Information Technology, Network, Linux and Security.

Troubleshooting SFP transceivers and Packet captures

In an older blog post I was writing about "Useful Cisco Commands for Troubleshooting cable problems". In this blog post I'm showing an additional, useful command for Fiber Optics troubleshooting and packet capturing on Cisco switches.

SiSyPHuS Win 10 Telemetry blocklist for Pi-Hole

Based on the latest SiSyPHuS Analysis of BSI I built a small blocklist for Pi-Hole to drop Win 10 Telemetry data collection

Cisco WLC - No secured WebUI after failover switching

Cisco WLC 3504 secured WebUI is not working on Secondary Unit in a failover (SSO) setup. When switched back to the Primary Unit, the secured WebUI is working again. Troubleshooting and solution of this strange behavior.

Some security settings for Apache Web Server

I'm showing in this blog post some security settings for the Apache web server including disabling of Directory Browsing, Server Signature and Server Token.

Integration of Nextbox UI Topology Viewer in Netbox

In this blog post I'm showing how to integrate NextBox UI Plugin into my Netbox installation. NextBox UI Plugin is a topology visualization plugin which is based on Cisco's neXt toolkit.

City of Erbach is ending their partnership with Odenwald gegen rechts

City of Erbach is ending their partnership with "Odenwald gegen rechts" ("Odenwald against Right")

WiFicalypse 2021

WiFicalypse 2021, FragAttacks. Design and Implementation flaws in WiFi.

Small Python script to quick test DMARCDKIM and SPF records

For a given occasion I wrote Small Python script to test a domain for DMARC, DKIM and SPF records. Those records are managed in a DNS Zone and are typically used in Anti-SPAM techniques.

Netbox Active Directory/LDAP Integration

In my newest blog post I show how to setup Netbox with Active Directory as backend for users and groups.

Concept for DNS security with Bind9, Pi-hole and OpenDNS

This is my new concept for DNS security with Bind9, Pi-hole and OpenDNS in my network. Bind9 is used as Enterprise DNS to resolve hostnames and IP addresses in the local area network, Pi-hole and OpenDNS are used for Internet DNS traffic. DNS traffic is passed by Cisco ASA Firewall ACL.

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