thierolf.org - Vom Hirn ins Terminal seit 1998.

Articles in category: Blog

NetFlow with Elastic-Stack

Written by Stefan on . Modified on . Posted in Blog. Tags: #cisco  #network  #security  #netflow  #elastic-stack 

This blog post shows how to setup a NetFlow collector with Elastic-Stack, Fleet and Elastic-Agent. NetFlow data is sent by a Cisco ASA Firewall cluster.


Technischer Schutz und Prozesse bei Datenlecks

Written by Stefan on . Modified on . Posted in Blog. Tags: #security 

In diesem Blog-Post beschreibe ich meine technischen Schutzmaßnahmen (Email) und Prozesse, wenn ich von einem Datenleck betroffen bin.


odenwald.social

Written by Stefan on . Modified on . Posted in Blog. Tags: #mastodon  #odenwald 

Just a quick announcement: Die Mastodon-Instanz odenwald.social ist freigeschaltet. Viel Spass ;)


Cisco Wireless Intrusion Detection Events to Elastic-Stack

Written by Stefan on . Modified on . Posted in Blog. Tags: #cisco  #network  #security  #wifi  #elastic-stack 

In this blog post I'm showing how to get Wireless Intrusion Detection Events from Cisco's WIDS included in Cisco's Wireless Controllers into an Elastic-Stack.


802.1X Switch port is amber when only IP Phone is connected

Written by Stefan on . Modified on . Posted in Blog. Tags: #cisco  #network  #security 

When 802.1X (wired) is configured on a 3750G switch, the port LED is amber when only an IP Phone is connected (mab). When connecting on the IP Phone a downstream device like a laptop (dot1x), the port LED goes to green.


Login-Block (DoS and Dict-Attack Protection) in Cisco IOS

Written by Stefan on . Modified on . Posted in Blog. Tags: #cisco  #network  #security 

Cisco offers a method to protect against DoS (Denial-of-Service) and Dictionary attacks for IOS devices called Login-Block.


Update Schneider-APCUPS firmware with Linux

Written by Stefan on . Modified on . Posted in Blog. Tags: #battery  #apc  #ups 

In this blog post I'm showing how to update a Schneider-APC UPS with Linux.


Mapping of IP addresses blocked by Russia

Written by Stefan on . Modified on . Posted in Blog. Tags: #internet  #security 

Mapping of IP addresses blocked by Russia


Werbeemails aufgrund LinkedIn Profils

Written by Stefan on . Modified on . Posted in Blog. Tags: #internet  #spam  #linkedin 

Werbeemails aufgrund LinkedIn Profils / SPAM mails due to LinkedIn Profile.


Tor project / Tor bridge

Written by Stefan on . Modified on . Posted in Blog. Tags: #internet  #network  #tor 

Tor project / Tor bridge.


New fiber optics cables for my network

Written by Stefan on . Modified on . Posted in Blog. Tags: #network  #fiber 

New fiber optics cables for my network. OM4, LC/LC connectors, 4x1 Gigabit link.


The 90’s reported in and delivered a phone book

Written by Stefan on . Modified on . Posted in Blog. Tags: #fun  #notfun 

The 90's reported in and delivered a phone book.


Synology DiskStation to Cisco Core Switch redundant setup with LACP

Written by Stefan on . Modified on . Posted in Blog. Tags: #synology  #cisco  #switch 

Configuration of LCAP (Link Aggregation Control Protocol) for Synology DiskStation and Cisco Switch.


Schneider-APCUPS battery replacement

Written by Stefan on . Modified on . Posted in Blog. Tags: #battery  #apc  #ups 

Small how-to about Schneider-APC UPS battery replacement and setting replacement date in Network management card.


Elastic-Stack for network engineers (Initial setup)

Written by Stefan on . Posted in Blog. Tags: #elastic-stack  #linux  #software 

Switching from traditional log monitoring to Elastic-Stack is like switching from a horse-drawn carriage to the Falcon 9 rocket. Join the journey!


Cisco SSM On-Prem Upgrade procedure

Written by Stefan on . Posted in Blog. Tags: #cisco  #software  #ssm 

This is another blog post for Cisco SSM On-Prem server where I'm showing the upgrade process.


Cisco ISE admin password lifecycle and reset

Written by Stefan on . Posted in Blog. Tags: #cisco  #ise  #software 

Quick notes about Cisco Identity Services Engine password lifetime and admin password reset.


Cisco SSM On-Prem password recovery procedure

Written by Stefan on . Posted in Blog. Tags: #cisco  #software  #ssm 

For a Cisco Smart Software Manager Test Drive installation I used the older version 8-202010 and I wanted to perform an upgrade to the latest version 8-202108. And of course it is a test drive, I did not save or wrote down the password :). In this document I'm describing how to perform a password recovery for a Cisco SSM On-Prem installation.


Upgrading Netbox to Version 3.0

Written by Stefan on . Modified on . Posted in Blog. Tags: #software  #netbox 

Yesterday, the version v3.0 of Netbox was released. Modernized WebUI and Off-canvas sidebar. My first impression: Version v3.0 is awesome! Note: Version v3.0.1 was released on 2021-09-01.


Gitlab AD-LDAP Integration

Written by Stefan on . Posted in Blog. Tags: #gitlab 

In this blog post I'm showing how to integrate GitLab Server with a Samba-based Active Directory.


Troubleshooting SFP transceivers and Packet captures

Written by Stefan on . Posted in Blog. Tags: #cisco 

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

Written by Stefan on . Posted in Blog. Tags: #security 

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

Written by Stefan on . Posted in Blog. Tags: #cisco  #wifi  #security 

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

Written by Stefan on . Posted in Blog. Tags: #security  #apache 

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

Written by Stefan on . Posted in Blog. Tags: #software  #netbox  #cisco 

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

Written by Stefan on . Posted in Blog. Tags: #odenwald 

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


WiFicalypse 2021

Written by Stefan on . Modified on . Posted in Blog. Tags: #wifi  #security  #wificalypse 

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


Small Python script to quick test DMARCDKIM and SPF records

Written by Stefan on . Modified on . Posted in Blog. Tags: #python  #infosec 

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

Written by Stefan on . Modified on . Posted in Blog. Tags: #software  #netbox  #django  #active directory  #ldap 

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

Written by Stefan on . Modified on . Posted in Blog. Tags: #security  #dns  #pi-hole  #asa 

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.


Humble Book Bundle - The Ultimate Python Bookshelf by Packt

Written by Stefan on . Posted in Blog. Tags: #books  #python 

Humble Book Bundle - The Ultimate Python Bookshelf by Packt including Data Analysis, Artificial Intelligence, Machine Learning, Django, Automation


Blocking of Google Chrome FLoC

Written by Stefan on . Posted in Blog. Tags: #security 

Blocking of Google Chrome FLoC (Federated Learning of Cohorts) on my web server


Weeks of the data leaks

Written by Stefan on . Posted in Blog. Tags: #security 

Weeks of the data leaks and my approach after data leaks or breaches


Debian Unattended upgrades

Written by Stefan on . Posted in Blog. Tags: #linux  #debian  #security 

Automatically install security-related upgrades on Debian Linux with unattended-upgrades


Most useful tip from Cisco Live 2021

Written by Stefan on . Posted in Blog. Tags: #ciscolive  #cisco  #wifi  #fun 

Most useful tip from Cisco Live 2021 and it's implementation


Fritzbox rack mounted

Written by Stefan on . Posted in Blog. Tags: #fritzbox  #fun 

Fritzbox rack mounted on a 19" shelf and it's hardware issues: white description on a white box, no LED on ports for activity, height unit issues, Square wood and Velcro to fix ;)


Check in of configuration files to a Gitlab server

Written by Stefan on . Posted in blog. Tags: #python  #netbox  #gitlab  #software 

This is the third part of a series of blog posts about Cisco configuration backup with Netbox and Gitlab. This blog post covers the check in of configuration files to a Gitlab server


Low Level Device functions for backup with Netbox and Gitlab

Written by Stefan on . Modified on . Posted in blog. Tags: #python  #netbox  #gitlab  #software 

This is the second part of a series of blog posts about Cisco configuration backup with Netbox and Gitlab. This blog post covers the low level functions to connect to network devices with pexpect.


Cisco configuration backup with Netbox and Gitlab

Written by Stefan on . Modified on . Posted in blog. Tags: #python  #netbox  #gitlab  #software 

This is the first part of a series of blog posts about Cisco configuration backup with Netbox and Gitlab. It covers the connection to the Netbox API and to get the data of network devices with the pynetbox filter function.


In case of fire

Written by Stefan on . Posted in Blog. Tags: #fun 

In case of fire: Leave the building before posting it on social media


Fritzbox on redundant ASA Firewall

Written by Stefan on . Modified on . Posted in Blog. Tags: #cisco  #asa  #fritzbox 

Setup of two redundant Cisco ASA firewalls on a Fritzbox cable modem with Non-routed transfer network to keep the "PC-MAC"/"exposed host" configuration on Fritzbox during ASA failover switching


Cisco Smart Software Manager Test Drive

Written by Stefan on . Modified on . Posted in Blog. Tags: #cisco  #software  #ssm 

Cisco Smart Software Manager (SSM) On-Prem Test Drive installation, Virtual Machine setup and first steps in the Web UI


Humble Book Bundle Programming Fundamentals

Written by Stefan on . Posted in Blog. Tags: #books  #programming 

Humblebundle.com has a nice books bundle of Programming Fundamentals, available as PDF and as EPUB, DRM-free


Upgrading memory on my XCP-NG hypervisors

Written by Stefan on . Posted in blog. Tags: #xcp-ng  #hardware 

Upgrading memory on my XCP-NG hypervisor servers from 32Gb RAM to 64Gb RAM


Looking up asset tags in Snipe-IT with QR code

Written by Stefan on . Posted in blog. Tags: #snipe-it  #linux  #software 

The blog post shows a Python script which can look up an Asset tag in Snipe-IT with a generated QR code


Creating QR code for wireless networks

Written by Stefan on . Posted in blog. Tags: #wifi  #linux 

Creating QR code for wireless networks and a MeCard with Linux


Official Cert Guide Cisco Certified DevNet Associate

Written by Stefan on . Posted in blog. Tags: #network  #cisco 

Official Cert Guide Cisco Certified DevNet Associate DEV ASC 200-901 book available and arrived from the USA to Germany.


Cisco DevNet Create 2020

Written by Stefan on . Posted in blog. Tags: #network  #cisco  #devnetcreate 

Some thoughts after the Cisco DevNet Create Live Event


Learning material for network automation

Written by Stefan on . Posted in blog. Tags: #network  #cisco 

Learning material for network automation with books, videos, podcasts, courses and API, libraries and tools


Installing Gitlab on Debian Linux

Written by Stefan on . Posted in blog. Tags: #software  #gitlab 

Installing Gitlab on Debian Linux and connecting with Atom editor


Netbox Login failed after upgrade to version 2.9.0

Written by Stefan on . Posted in blog. Tags: #software  #netbox 

After an upgrade to the new released version 2.9.0 of NetBox the Login failed with Server Error (Missing required package/WSGI service not restarted after upgrade)


Netbox Custom Links for Snipe-IT and LibreNMS

Written by Stefan on . Posted in blog. Tags: #software  #netbox  #snipe-it  #librenms 

Python scripts with API calls as Custom Links for Snipe-IT and LibreNMS.


DEFCON 28 - Safe Mode with Networking

Written by Stefan on . Posted in blog. Tags: #defcon 

Today DEF CON 28 is starting in Safe Mode with Networking


Custom links in Netbox for Snipe-IT Asset Management

Written by Stefan on . Posted in blog. Tags: #software  #netbox  #snipe-it  #python 

Integration of Snipe-IT Asset Management into Netbox DCIM/IPAM as Custom Link with a PHP script and using Snipe-IT API call.


Moving my website to Pelican (Static Site Generator)

Written by Stefan on . Posted in blog. Tags: #software  #website 

Moving my website to Pelican (Static Site Generator) with introduction to my toolchain, tricks for development, pelican-plugins used on my website and design changes and other improvements


Upgrading XCP-NG Hypervisor from version 7.6 to version 8.1

Written by Stefan on . Posted in blog. Tags: #software  #xcp-ng 

Upgrading XCP-NG Hypervisor from version 7.6 to 8.1 remotely over VPN connection and KVM. Fixing IPTables and SNMP configuration for monitoring system.


Netbox: New installation (2.8.5) and NAPALM plus LibreNMS API integration

Written by Stefan on . Posted in blog. Tags: #software  #netbox  #python  #librenms 

This is the third part of a series of blog posts covering my new netbox installation. This part shows how to integrate NAPALM and Graphs on device Interfaces from the Monitoring system LibreNMS.


Netbox: New installation (2.8.5) and cabling and assigning IP addresses

Written by Stefan on . Posted in blog. Tags: #software  #netbox 

This is the second part of a series of blog posts covering my new netbox installation. The rack is filled up with the rest of the hardware and each network port is getting cabled. This part contains also IPAM (IP Address Management) and handling of Provider and Circuits.


Netbox: New installation (2.8.5) and filling up an empty rack

Written by Stefan on . Posted in blog. Tags: #software  #netbox 

This is the first part of a series of blog posts covering my new netbox installation. It covers the defining of manufacturers, device types, power panels and power feeds. An UPS, Power Strips and two Cisco switches are added including their Power cabling. As bonus, the Cisco switches are build as Virtual Chassis (Cisco Switch-stack).


Why 2.4 GHz WiFi is bad

Written by Stefan on . Posted in blog. Tags: #wifi  #cisco 

Cisco CleanAir quality report for 2.4GHz WiFi in my area


Useful Cisco Commands for Troubleshooting cable problems

Written by Stefan on . Posted in blog. Tags: #cisco  #cabling 

Useful Cisco Commands for Troubleshooting problematic cabling (Cat.x and Fiber optics).


Simple High Availability with CARP

Written by Stefan on . Posted in blog. Tags: #apache  #software 

Simple High Availability with CARP (Common Address Redundancy Protocol)


Cisco Live 2020 Barcelona, Day 5

Written by Stefan on . Posted in blog. Tags: #ciscolive  #cisco  #travel  #spain 

Cisco Live 2020 Barcelona, Day #5 - SD-WAN, deployment strategies, managing and monitoring


Cisco Live 2020 Barcelona, Day 4

Written by Stefan on . Posted in blog. Tags: #ciscolive  #cisco  #travel  #spain 

Cisco Live 2020 Barcelona, Day #4 - Catalyst 9000 Access Switching Architecture and Resolving Network Faults Faster through Automating Entire Fault Management


Cisco Live 2020 Barcelona, Day 3

Written by Stefan on . Posted in blog. Tags: #ciscolive  #cisco  #travel  #spain 

Cisco Live 2020 Barcelona, Day #3 - About Garlic and Onions and Industrial automation


Cisco Live 2020 Barcelona, Day 2

Written by Stefan on . Posted in blog. Tags: #ciscolive  #cisco  #travel  #spain 

Cisco Live 2020 Barcelona, Day #2 - Attack Kill Chain and Packet Capturing


Cisco Live 2020 Barcelona, Day 1

Written by Stefan on . Posted in blog. Tags: #ciscolive  #cisco  #travel  #spain 

Cisco Live 2020 Barcelona, Day #1 - A cat and mouse Game


Simple load balancing with Apache proxy_balancer

Written by Stefan on . Modified on . Posted in Blog. Tags: #software  #apache  #xcp-ng 

Simple load balancing with Apache proxy_balancer and testing with siege


Replacing faulty memory for Cisco ASA-5520

Written by Stefan on . Posted in Blog. Tags: #cisco  #asa  #hardware 

Replacing faulty memory for Cisco ASA-5520, checking memory and failover


Watching You Watch

Written by Stefan on . Posted in Blog. Tags: #security 

Princeton University and University of Chicago published a study of the tracking Ecosystem of Over-the-Top TV Streaming Devices


Humble Book Bundle Linux Unix and Bruzzelhuette Hamburg

Written by Stefan on . Posted in Blog. Tags: #fun  #travel  #books  #linux 

Humblebundle.com has a nice books bundle of Linux + Unix books by O'Reilly. And a tipp for the best Currywurst: Bruzzelhütte, Hamburg


NetBox, Snipe-It and LibreNMS

Written by Stefan on . Posted in Blog. Tags: #netbox  #snipe-it  #librenms  #software 

NetBox, Snipe-It and LibreNMS: Three tools for Data Center Information Management (DCIM), IT Asset Management (ITAM) and Network Monitoring System (NMS).


Cisco ASA5520 stuck at Booting system, please wait…

Written by Stefan on . Posted in Blog. Tags: #cisco  #asa  #hardware 

Cisco ASA5520 stuck at Booting system, please wait... and how to check for faulty memory


Convert Cisco lightweight AP to standalone AP

Written by Stefan on . Posted in Blog. Tags: #cisco  #wifi 

The procedure how to convert a Cisco lightweight AP to a standalone AP


Humble Book Bundle IT Security

Written by Stefan on . Posted in Blog. Tags: #books  #security 

Humblebundle.com has a nice books bundle of IT Security books, available as PDF and as EPUB, DRM-free


Cisco Unified IP Phone 7975G with Sipgate

Written by Stefan on . Posted in Blog. Tags: #cisco  #phone  #hardware 

Cisco Unified IP Phone 7975G with Sipgate, from configuring switches, setting up DHCP and TFTP, and do the correct SEPMAC.cnf.xml file configuration and firewall ACL.


Building a High-Availability cluster with XCP-NG

Written by Stefan on . Posted in Blog. Tags: #xcp-ng  #software 

Building a High-Availability cluster with XCP-NG


Alienware laptop hardware replacement

Written by Stefan on . Posted in Blog. Tags: #alienware  #hardware 

Alienware laptop hardware replacement


Connecting to Cisco console with Linux

Written by Stefan on . Posted in Blog. Tags: #cisco  #linux 

Connecting to Cisco console with Linux


Testing Panduit CBOT24K cabling organizer

Written by Stefan on . Posted in Blog. Tags: #cabling  #hardware 

Testing Panduit CBOT24K cabling organizer


Creating ROOT-CA-based certificates for Cisco Wireless Controller

Written by Stefan on . Posted in Blog. Tags: #cisco  #wifi  #security 

Creating ROOT-CA-based certificates for Cisco Wireless Controller


Creating ROOT-CA-based certificates for Synology Diskstation

Written by Stefan on . Posted in Blog. Tags: #synology  #security 

Creating ROOT-CA-based certificates for Synology Diskstation


Blocking Facebooks networks on ASA firewall

Written by Stefan on . Posted in Blog. Tags: #cisco  #asa 

Blocking Facebooks networks on ASA firewall


35C3 and braindump about blocking of facebooks network ranges

Written by Stefan on . Posted in Blog. Tags: #website  #ccc 

35C3 and braindump about blocking of facebooks network range


Datenschutzbehoerden in Deutschland

Written by Stefan on . Posted in Blog. Tags: #privacy 

Liste der Datenschutzbehoerden in Deutschland


How to securely put your boarding pass on the internet

Written by Stefan on . Posted in Blog. Tags: #travel  #ccc 

How to securely put your boarding pass on the internet


Oh no, snow

Written by Stefan on . Posted in Blog. Tags: #notfun 

Oh no, snow


Schnitzel Day (with Wiener Schnitzel)

Written by Stefan on . Posted in Blog. Tags: #travel  #germany 

Schnitzel Day (with Wiener Schnitzel) in Germany


Setting up Cisco 3504 series wireless controller redundancy

Written by Stefan on . Posted in Blog. Tags: #cisco  #wifi 

Setting up Cisco 3504 series wireless controller redundancy


In Germany… Hacker-Conference comes to you

Written by Stefan on . Posted in Blog. Tags: #blackhat  #defcon  #fun  #travel 

In Germany... Hacker-Conference comes to you


Setting up administrative RADIUS logins on AIR-AP2800 with Mobility Express

Written by Stefan on . Posted in Blog. Tags: #cisco  #wifi 

Setting up administrative RADIUS logins on AIR-AP2800 with Mobility Express


WiFicalypse continued

Written by Stefan on . Posted in Blog. Tags: #wifi  #security 

WiFicalypse continued, new method to speed up cracking of WPAv1 / WPAv2 Pre-sharded keys


Activate CLI Commands on Lightweight AP

Written by Stefan on . Posted in Blog. Tags: #cisco  #wifi 

A Trick to activate CLI Commands on Cisco Lightweight AP


Lunar Eclipse 2018

Written by Stefan on . Posted in Blog. Tags: #science 

Some impressions of the lunar eclipse 2018 over Germany


Saveconfig Backup scripts

Written by Stefan on . Modified on . Posted in Blog. Tags: #cisco  #software 

saveconfig, two scripts to backup configuration files from network devices


Optimierungen und Static Site Generator

Written by Stefan on . Posted in Blog. Tags: #website 

Optimierungen und Static Site Generator, Automatisierung für meine Website


Create ASA Firewall rule from Talos IP Blacklist

Written by Stefan on . Posted in Blog. Tags: #cisco  #asa 

A simple bash script to create ASA Firewall rules from Talos IP Blacklist


Independence Day und Website Updates

Written by Stefan on . Posted in Blog. Tags: #website 

Anmerkungen zum Independence Day und Website Updates mit Volltext-Suche


Bilder Modelleisenbahn

Written by Stefan on . Posted in Blog. Tags: #fun 

Ältere Bilder meiner Modelleisenbahn (Lokomotiven und Wagen)


Added GDPR (DSGVO)

Written by Stefan on . Posted in Blog. Tags: #website 

Added GDPR - General Data Protection Regulation / DSGVO - Datenschutzgrundverordnung


Icebound

Written by Stefan on . Posted in Blog. Tags: #notfun 

Icebound. Too much snow and ice for me.


Travel to Germany

Written by Stefan on . Posted in Blog. Tags: #travel  #fun  #germany 

Travel to Germany, returned with some fun stuff


WiFicalypse Update

Written by Stefan on . Posted in Blog. Tags: #wifi  #security  #wificalypse 

WiFicalypse Update with vendor lists, press statements


WiFicalypse

Written by Stefan on . Posted in Blog. Tags: #wifi  #security  #wificalypse 

WiFicalypse, KrackAttack to break WPA version 2


WiFi Spectrum Analysis

Written by Stefan on . Posted in Blog. Tags: #cisco  #wifi  #hardware 

WiFi Spectrum Analysis with Cisco 3600 Series AP and Outdoor antenna


Websites updates

Written by Stefan on . Posted in Blog. Tags: #website 

Websites updates, my old website thierolf.org is back online, yeah!


Mein privates Cisco Lab

Written by Stefan on . Posted in Blog. Tags: #cisco  #hardware 

Mein privates Cisco Lab mit Switches, Firewall, Routers, WiFi Controller


Rsyslog with MariaDB template

Written by Stefan on . Posted in Blog. Tags: #syslog  #mariadb  #software 

Changing Rsyslog's default template for a MariaDB database


Solar Eclipse 2017 in New Hampshire

Written by Stefan on . Posted in Blog. Tags: #science 

Solar Eclipse 2017, Impressionen der Sonnenfinsternis aus New Hampshire, USA


Cyber-Feuerwehr

Written by Stefan on . Posted in Blog. Tags: #fun  #notfun 

Cyber-Feuerwehr and Cyber-System failure


Quick overview of the 802.11 standards

Written by Stefan on . Posted in Blog. Tags: #wifi 

A quick overview of the 802.11 standards for Wireless networks


Theme and website updates

Written by Stefan on . Posted in Blog. Tags: #website  #ccc 

Theme and website updates and ticket for 34C3


Website updates and SHA2017

Written by Stefan on . Posted in Blog. Tags: #website  #ccc 

Website updates and SHA2017 videos on CCC media server


CSAchecker

Written by Stefan on . Modified on . Posted in Blog. Tags: #cisco 

CSAchecker, a Cisco Security Advisory checker


Convert Cisco 2600 Series Access Point

Written by Stefan on . Posted in Blog. Tags: #cisco  #wifi 

Short instructions how to convert a Cisco 2600 Series Access Point


Common Cisco switch port errors

Written by Stefan on . Posted in Blog. Tags: #cisco 

Overview of common Cisco switch port errors and causes


Travel to Mexico

Written by Stefan on . Posted in Blog. Tags: #travel  #mexico 

Travel to Mexico: Photos of my trip from Metepec downtown


Secure Cisco console with AAA

Written by Stefan on . Posted in Blog. Tags: #cisco 

How to secure the Cisco console with AAA


Snow snow snow

Written by Stefan on . Posted in Blog. Tags: #notfun  #website 

Snow snow snow: After Winter Storm Orson


New Cisco switch for my network

Written by Stefan on . Posted in Blog. Tags: #hardware  #cisco 

New Cisco switch for my network: WS-C3750G-24TS-S1U


Move SSH port on Cisco devices

Written by Stefan on . Posted in Blog. Tags: #cisco 

How to move SSH port on Cisco devices to another port than TCP/22


Welcome KEY-LOH-OSS-CAH-NO-VEM-BER

Written by Stefan on . Posted in Blog. Tags: #gaming  #fun 

Playing Elite:Dangerous - Welcome KEY-LOH-OSS-CAH-NO-VEM-BER.


Updated links and new Alienware laptop

Written by Stefan on . Posted in Blog. Tags: #hardware  #alienware 

Updated links and new Alienware laptop after my return flight to the US


Setup Postfix satellite System

Written by Stefan on . Posted in Blog. Tags: #software  #postfix 

How to setup Postfix as satellite System (smarthost)


Website update mit Flex Box

Written by Stefan on . Modified on . Posted in Blog. Tags: #website 

Website update mit Flex Box, Motto: Vom Hirn ins Terminal seit 1998.


Cowsay fortunes mit lolcat

Written by Stefan on . Posted in Blog. Tags: #linux  #fun 

Spass mit der Console: Cowsay fortunes mit lolcat unter Debian Jessie


Sicherer Mail server fertig

Written by Stefan on . Posted in Blog. Tags: #software  #postfix 

Sicherer Mail server fertig, mit Crypto und so


Neue Website online

Written by Stefan on . Posted in Blog. Tags: #website 

Neue Website online (Mal wieder richtige Website anstelle einer Mail-Info)


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