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Installation GNS3 in Debian 12

In this article, I present an update of the process of installing GNS3 in Debian 12, based on the previous post for Debian 11. If you need more detailed details about the installation or configuration of GNS3, I recommend you review the previous version. GNS3 installation We update the repositories and install the available system updates. javiercruces@HPOMEN15:~$ sudo apt update -y && sudo apt upgrade -y We install the necessary dependencies for GNS3, including Python, virtualization tools (KVM, QEMU, libvirt), additional libraries (PyQt5, dynamipes) and other utilities.

Sunday, September 8, 2024 | 3 minutes Read

Basic IPv6 Scenario

Throughout this guide, we will explore the configuration of a basic scenario using IPv6 networks on both Linux and Cisco devices. We will also address the configuration of an Apache server using IPv6 capabilities. Linux IPV6 Self-Configuration Connect two Linux machines to the same switch and check that they have IPv6 connectivity using the local link address. We’ll check the IPV6 that the different pcs have. PC1 has - > fe80::ef7:42ff:fe92:0/64

Sunday, October 8, 2023 | 13 minutes Read

ARP Protocol

The Address Resolution Protocol (ARP) is fundamental in computer networks to map IP addresses to physical link layer addresses (MAC). Its main function is to find the MAC address associated with a specific IP address on a local network. When one device needs to communicate with another on the same network, it uses ARP to determine the MAC address of the destination before sending data. Do you think the ARP question is a message of dissemination? Make a Wireshark capture of an ARP request and analyze it to justify your response. Yes, it is a message of dissemination as in the header we can see that the destination has a broadcast address. This address is the one that has all its bits at 1 which in the mac addresses is translated into FF:FF:FF:FF:FF:FF.

Friday, September 8, 2023 | 7 minutes Read

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:

Friday, September 8, 2023 | 11 minutes Read

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. –>

Friday, September 8, 2023 | 19 minutes Read

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.

Friday, September 8, 2023 | 14 minutes Read

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.

Friday, September 8, 2023 | 4 minutes Read