Thanks to NGZ That I lost all my Data

Reading Time: < 1 minute Due to a Problem with the Provider hosting my Blog, I lost all my data from the last 7 years of writing. I had a local backup, but their backup script messed it up and deleted everything. I will try to catch up as fast as possible to create new content for you. I will … Read more

Unified Aruba Controller Discovery

Reading Time: 7 minutes This time is about some basic things. I will describe the unified Aruba controller discovery process. With the new unified software, the process is the same for IAP and CAP. Actually, with the new unified software, there is no IAP or CAP anymore. The Aruba discovery process is a simple process. The AP uses this … Read more

Backup ESXi Server – Lab System

Reading Time: 7 minutes My lab environment is more and more important for some of my daily tasks. But I do not care about the system itself. The only requirement is that it has to run. but as it get’s more and more important I started thinking about a backup. ESXi has no built-in function for this and external … Read more

VXLAN: Implementation

Reading Time: 8 minutes This post will describe one option to implement a VXLAN enabled fabric. I will use VSR router to create the fabric and create the overlay using VXLAN. I already gave a general overview about VXLAN in an earlier post here:VXLAN: What is VXLAN VXLAN Implementation Introduction Before I will start to describe the configuration I … Read more

Traffic Capture with VMWare ESXi

Reading Time: 5 minutes My plan is to blog more about solutions and how to configure them and show how the packets look like. As I haven’t plenty of hardware I will use VMWare ESXi to simulate most of the stuff using HPE VSR routers. Therefore I was looking for a way to capture traffic of a specific VM … Read more

HowTo: Setup an OpenVPN Server

Reading Time: 8 minutes This time, I would like to describe how I setup my OpenVPN server at home. I use this server to tunnel my traffic home, when using an open Wifi network at hotels or airports, to make sure, my traffic is encrypted. I also use the tunnel. to get access to my mail server when being … Read more

HowTo: Backup My Server

Reading Time: 6 minutes This time I would like to explain how I backup my server with the help of some build in tools and a script written by myself. As I’m running my blogs and my mail server, which is Scalix, on a Linux server I need to make sure, that no data is lost during an outage … Read more

HowTo: Proxmox Live Backup

Reading Time: 3 minutes In this post, I will show, how to configure and schedule Proxmox live backup to get a full backup of your VM without downtime. I use this for my server once a week and save the created backup to an external backup device. Configure Proxmox Live Backup The Proxmox live backup uses the snapshot technology of … Read more

HowTo: Postfix with SPF

Reading Time: 4 minutes In this post, I would like to explain the usage of SPF (Sender Policy Framework), which could be used to prevent spam. SPF will use the DNS system to tell the receiving mail server, whether the sending server is allowed to send mails for this domain. As this is the basic concept, I will explain … Read more

HowTo: Postfix and Dovecot in front of Scalix

Reading Time: 4 minutes In this post I would like to show, how to set up Postfix and Dovecot in front of Scalix on a Debian system, for security and mail filter reasons. I assume, that you have a running Scalix installation and full management access. If you need help to install Scalix on Debian, you can use my last … Read more