Archives for 2022

Add Virtual Machine to NetBox with an Ansible playbook

Written by Stefan on Wed 30 November 2022. Posted in Blog.

In this blog post I'm showing how to get a Virtual Machine, defined in an Ansible inventory file, into the NetBox DCIM (Data Center Information Management) tool.

NetFlow with Elastic-Stack

Written by Stefan on Tue 02 August 2022. Posted in Blog.

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 Sun 24 July 2022. Posted in Blog.

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

Cisco Wireless Intrusion Detection Events to Elastic-Stack

Written by Stefan on Tue 07 June 2022. Posted in Blog.

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 Sat 21 May 2022. Posted in Blog.

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 Thu 21 April 2022. Posted in Blog.

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 Mon 14 March 2022. Posted in Blog.

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 Sun 06 March 2022. Modified on Thu 28 July 2022. Posted in Blog.

Mapping of IP addresses blocked by Russia

New fiber optics cables for my network

Written by Stefan on Mon 28 February 2022. Posted in Blog.

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

Synology DiskStation to Cisco Core Switch redundant setup with LACP

Written by Stefan on Wed 16 February 2022. Posted in Blog.

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

Schneider-APCUPS battery replacement

Written by Stefan on Thu 03 February 2022. Posted in Blog.

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