Docker Containers by examples – Intro
Intro This article is the first of a series that I called "Docker containers by examples" where I am sharing my experience in learning and using Docker in real life…
GNU/Linux Automatic Security updates with cron-apt and e-mail notifications (msmtp)
Everytime I build a new server one of the feature that I immediately configure is to install security update automatically for the Operating System and installed pakckages. In Debian you…
[LinuxAdmin] E-mail with Push notifications with fetchmail
I have several e-mail accounts that are managed from a single server. The way they are managed consists in having fetchmail retrieving (fetching, indeed) every configured amount of seconds. Of…
[HowTo] Automated VPS backup from NAS Qnap
Yet another small how-to that will work mainly as a way for myself to remember how I did setup a QNAP NAS Appliance to use rsync with ssh and make…
[HowTo] Install Coreboot and disable Intel ME on Lenovo Thinkpad X230
I have been promising to myself for very long time that one day I had to have a computer as much privacy focused as possible. As I cannot afford to…
[How To] Monero (XMR) Wallet with Trezor Model T
Recently the GitHub user ph4r05 released some commits for the Monero wallet GUI that enabled the use of Trezor Model T with the Monero cryptocurrency (XMR). As the commits are…
[SysAdmin] Create isolated WiFi network on OPNSense with local wireless interface
During the last months I am using OPNSense as my firewall (moving away from PFSense). At the very beginning I was using it on an apu2d board but then I…
Configure OpenVSwitch and libvirt to enable trunking (802.1q) between KVM Guests
The goal of this article is to cover a complete configuration of OpenVSwitch and KVM networking to have ports of the virtual switch allowing trunking toward the KVM guests. The…
[Networking Lab] GNS3 Lab to practice with OSPF LSA types and areas (TCP/IP Volume I)
Here we go with another Lab with GNS3 and IOU. This time is to review and practice the OSPF configurations as well as LSA types, Areas, routing table, virtual links…
[Networking Lab] RIP and RIPng configuration exercise (TCP/IP Volume 1)
Hi there! Yet another GNS3 laboratory for a bit of practice. This time I arranged the starting configuration to play with RIP and RIPng following the exercise found on TCP/IP…
[Networking Lab] Static route and load sharing practising (TCP/IP Volume 1)
This GNS3 laboratory is a simple reproduction of the Configuration exercise number 3 of Chapter 3 (static routing) of the well known book TCP/IP Volume 1 for the CCIE professional…
[Networking] Select a mask so that there will be a specific number of subnets and hosts available
This is mainly a reminder for myself and for who is working with subnetting and with the always arising question about how to work with subnets design. The question to…
[Linux server] How to update DNS entries from DHCP to BIND9
After talking about this topic with a friend during last week, I decided to start running a local DNS server in my home network. The goals of the server are:…
[Networking Lab] Configure 802.1x authentication on Cisco switch IOU with GNS3
In this post I will show you again the power of GNS3 in doing laboratories to test new features. I will provide you a Lab example to configure and test…
[Networking – Lab] Ready-to-go GNS3 Switch and Routers config for your lab.
A lot of times, when you would like to reproduce some behavior in a Network, you need to add a lot of basic configs on your routers and switches. You…