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  • Posts
  • CI / CD Jenkins
    • CI / CD practice with Jenkins
    • Workshop 1 Ortho-rector of markdown documents (test)
    • Workshop 2 Valid HTML5 check and surge.sh deployment (test and deploy)
    • Workshop 3 Continuous integration of django application (Test)
  • Database
    • Install MariaDB in Debian
    • Interconnection of database servers
    • Oracle 19c installation under Debian 12
    • PostgreSQL installation in Debian 12
    • Remote access configuration in Oracle
    • Remote access in MariaDB
  • Docker
    • Docker Compose Installation on Ubuntu 24
    • Docker Installation on Ubuntu 24
    • Workshop 1 Storage and networks in Docker
    • Workshop 2 Multicontainer Scenarios in Docker
    • Workshop 3 Image creation Docker
  • Firewall
    • Fortinet CLI
    • Perimetral with Fortinet I
    • Perimetral with Fortinet II
    • Perimetral with Nftables I
    • Perimetral with Nftables II
  • Linux Drivers
    • Drivers Nvidia
    • How to choose which graph to use on my laptop with Linux
  • Networks
    • Android GNS3-KVM
    • Basic IPv6 scenario
    • GNS3 and Wireshark installation
    • GNS3 installation in Debian 12
    • GNS3 switch configuration
    • IPV6 Tunnels
    • NAT in Cisco and Linux
    • Network monitoring commands
    • OpenStack routing
    • Protocol ARP
    • Underworld
    • Underworld evolution
  • Observability
    • Metrics
      • Prometheus
        • Installation of Prometheus with Docker Compose and Node Exporter on Debian 12
  • Security
    • Forensic computer
    • HTTPS
  • Services
    • Apache
    • DHCP
      • Installation and Configuration of a DHCP Server on Linux
    • DNS
      • BIND9
        • Configuring a Slave DNS Server with BIND9
        • Installation and Configuration of BIND9 on Linux
      • DNSMASQ
        • Local Server with DNSMasq
    • FTP
    • NAT with iptables
    • SSH
  • Systems
    • Active Directory in Ubuntu
    • Centralized collection of logs journald
    • Compilations in LINUX
      • Compilation of a C-program using a Makefile
      • Compilation of a kernel
    • Creation of an automated installation system
    • Install and configure samba in Debian
    • Linux Command
      • Kernel parameter modification exercises
      • Linux processes
      • Module management exercises
      • Package management
      • Packaging and compressors
      • Paid management exercises
      • Task programming
    • Migration in Linnux
      • File system
      • Migtation from CentOS stream 8 to CentOS stream 9
      • Systemd elimination
      • Transformation instance cloud
    • NFS in Debian
    • SELinux activation configuration
    • Share resources in Windows
    • Ssh service in Windows
    • Storage Spaces in Windows Server
  • VPN
    • OpenVPN and Wireguard Comparative
    • OpenVPN remote access
    • Remote access Ipsec StrongSwan
    • Site-to-Site IPsec Cisco
    • Site-to-Site IPsec Fortinet
    • Site-to-Site OpenVPN
    • Site-to-Site Wireguard
    • Wireguard remote access
  • Web applications
    • LAMP stack installation
    • LEMP stack installation
    • WordPress LAMP
    • WordPress LEMP
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FTP under debian

FTP server under debian Installation and configuration of the authenticated proFTPd server First we will create a group called ftpgroup: Create two local users from the ftp group we have created: Jose and Maria We install the ftp service: Basic configuration of the proftpd.conf file: All users access your directory only: We can now access from the browser with users Jose and Maria: Each of these I have created a folder with your name within your personal directories in order to identify them.

  • Servicios
  • NAT
  • SMR
  • IPTABLES
  • SNAT
  • SSH
  • FORWARDING
  • APACHE
  • FTP
Friday, September 8, 2023 | 2 minutes Read
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GNS3 switch configuration

You will learn to configure switches in GNS3, both generic devices and Cisco switches, using the VLans concept to segment the network and explore the complexities of network management. Stage preparation The first thing I’ll do is set up the stage: Customer network configuration Then set up the network cards of the customers, taking advantage that the NAT cloud includes a DHCP server. To do this, we write on the VPCS the following command:

  • Redes
  • Wireshark
  • GNS3
  • Cisco
  • Switches
Friday, September 8, 2023 | 11 minutes Read
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Installation GNS3 and Wireshark in Debian

**This post was developed for Debian 11. If you have a more recent version, you can review the Debian 12 post you will find in the network section of the same page. The only part you should not follow if you meet this condition is the installation of GNS3. The rest of the content is still valid. –>

  • Redes
  • Wireshark
  • GNS3
Friday, September 8, 2023 | 19 minutes Read
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Installing and Configuring a DHCP Server on Linux

Configuring the DHCP Server on Debian In this article, you will learn how to configure the isc-dhcp-server. Additionally, we will configure an IP reservation and set it up to operate on two different scopes. Here is my DHCP server’s network configuration: # Router external network auto ens4 iface ens4 inet dhcp # Internal network 1 auto ens5 iface ens5 inet static address 192.168.10.1 netmask 255.255.255.0 # SNAT for ens5 network , ensure that bit of forwarding is activated. post-up iptables -t nat -A POSTROUTING -o ens4 -j MASQUERADE post-down iptables -t nat -D POSTROUTING -o ens4 -j MASQUERADE # Internal network 2 auto ens6 iface ens6 inet static address 192.168.20.1 netmask 255.255.255.0 Installing the isc-dhcp-server To install the DHCP server on Debian, run the following command:

  • Services
  • NAT
  • SMR
  • DHCP
  • SNAT
Friday, September 8, 2023 | 4 minutes Read
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IPv6 Tunnels

Introduction In this detailed post, we explore the process of configuring IPv6 to IPv4 tunnels and vice versa in Linux and Cisco environments. As the migration to IPv6 gains importance, the ability to establish communication between IPv4 and IPv6 networks becomes essential. We will cover the basics of tunnel configuration, including the most common types of tunnels, such as 6to4 and Teredo. Additionally, we will provide step-by-step instructions for configuration on both Linux systems and Cisco devices.

  • Networking
  • IPv6
  • IPv4
  • Cisco
  • Linux
Friday, September 8, 2023 | 10 minutes Read
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Linux Process Management

In the Linux ecosystem, a process is the execution of a specific program that performs a particular task. Each process has its own unique identifier (PID) and is composed of a set of resources, such as memory and CPU, that allow it to operate independently. In the Linux universe, effective process management is a crucial ability to optimize performance and ensure system stability. This post will immerse you in the essential foundations of process management

  • Debian 12
  • Sistemas
  • ISO
  • ASO
Friday, September 8, 2023 | 7 minutes Read
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Migration of a file system

Sometimes, it is necessary to update the storage of our Debian system to meet the growing space needs and improve the organization of the disk. In this guide, we will explore the migration process from a single disk to one with greater capacity, as well as divide it into separate partitions for more efficient management. This process will not only expand the available storage space, but also provide a more orderly structure to the system, facilitating tasks such as backup management, system performance and disk space management.

  • Debian 12
  • Sistemas
  • ISO
  • ASO
Friday, September 8, 2023 | 5 minutes Read
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NAT Cisco and Linux Configuration

In this article, we will explore the configuration of SNAT (Source Network Address Translation) and DNAT (Destination Network Address Translation) in scenarios with public addresses, using routers in Linux environments and Cisco devices. Scenario with debian machines Preparation of the environment Installation of packages Once the machines are placed we must download Apache for the web servers, to do this we will connect both servers to a switch and this to the NAT cloud for Internet access.

  • Redes
  • Enrutamiento
  • NAT
  • SNAT
  • DNAT
  • Cisco
  • Linux
Friday, September 8, 2023 | 14 minutes Read
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NAT with iptables

NAT with iptables In this article you will learn to set up a small scenario in which you can set up a series of services. You will create the scenario described below, and you will make it through an internal network, using a Linux server, that you have access to the Internet by configuring SNAT in it by using iptables. Installation of the test environment We will install the following environment:

  • Servicios
  • NAT
  • SMR
  • IPTABLES
  • SNAT
Friday, September 8, 2023 | 2 minutes Read
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Network monitoring commands

A document in which the main commands are detailed when it comes to detecting and solving network incidents. Windows Command Explains the meaning of the different parameters to be configured in the TCP / IP Properties in Windows We have to keep in mind that every configuration we make is independent for each of our network adapters. To access these parameters we will follow the following route in our system:

  • Network
  • comands
Friday, September 8, 2023 | 23 minutes Read
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OpenStack routing

In this practice, we will explore the creation of a scenario through the OpenStack orchestration and then we will conduct the routing to ensure connectivity between the different virtual machines. This exercise will allow us to understand and apply the use of OpenStack to manage virtual environments, as well as to set up the network efficiently to facilitate communication between different devices on the stage. Scenario to ride in OpenStack In order to mount our OpenStack scenario due to the current situation of the images available, we will need to prepare an instance that has password access enabled. In addition, if you want to set up another one to enable the ssh password access for this user.

  • Redes
  • Enrutamiento
Friday, September 8, 2023 | 4 minutes Read
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Packaging and compressors in Linux

Packers and compressors are key elements in the management of files and data in the computer field. The packers allow to group several files in a single container, facilitating their handling and transport. On the other hand, compressors apply techniques to reduce file size, contributing to storage space savings and expediting data transfer. These tools play a crucial role in resource optimization and operational efficiency by more effectively organizing, distributing and supporting information.

  • Linux
  • Sistemas
  • ISO
  • ASO
Friday, September 8, 2023 | 11 minutes Read
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