linux

The information provided in this post is for educational and informational purposes only. All rights to the software used belong to their respective owners. I’ve read quite a few tutorials on Netmiko with GNS3, but none of them show you how to directly utilize the console connection as the management interface for Cisco devices. In addition to the CiscoIosSSH driver, Kirk Byers also implemented the CiscoIosTelnet driver for establishing a connection to a Cisco device....

Before we work our way through the steps, I will start by pointing out GNS3 server has the following constraints when running on Apple Silicon: Lack of Linux KVM for x86_64 virtualized guests Slight performance penalty with emulated x86_64 Linux binaries (Rosetta ) The following are my results after testing a number of different Cisco device types: Device Working? Information IOL ✅ - IOL L2 ✅ - IOSv ✅ - IOSv L2 ✅ - ASAv ❌ Requires SSSE3 CPU instructions for cryptographic operations Catalyst 8000V ❌ Requires vmx or svm CPU flag for Linux KVM Nexus 9000v ❌ Requires vmx or svm CPU flag for Linux KVM As you can see, we’re primarily limited to Cisco (IOL , IOSv , Dynamips ) images, VPCS, and Docker containers....

Vagrant supports three types of networks: public, private, and port-forwarding. The private network type has the option to use a UDP tunnel for a point-to-point link when using the vagrant-libvirt plugin. This connection type is ideal for links between virtual network devices. Refer to the following resources if you need more information: Pseudo-wires With Vagrant and Libvirt vagrant-libvirt Networks Vagrant Private Networks The only drawback with this type of connection is concerning packet sniffing....

After opening the GNS3 client and starting nodes, we primarily access the remote virtual devices with a console connection. This console connection is either Telnet, VNC, or SPICE. A console connection covers our requirement for physical access to the virtual devices, but today most administrative tasks are carried out with a link to the network management interface . I define the GNS3 server as remote if the gns3server process is not running on the host operating system....

This post is a companion to the previous GNS3 with Microsoft Azure post. For many of us, an asymmetrical Internet connection usually equates to a much slower upload than download speed. Specifically, in our case, this results in a time-consuming process of uploading GNS3 image files to our remote gns3server VM instance. What if we need to recreate the disk attached to our gns3server VM instance? Modify the type (i....

Microsoft Azure is one of the big three public cloud computing providers for services such as virtual machines (VMs), containers, server-less computing, and machine learning. Azure is a large platform, but we’re focused solely on the Infrastructure as a Service (IaaS) resources in this guide. The GNS3 architecture is comprised of three primary components: User Interface (UI), Controller, and the (Compute) Server. The Server is the component that puts a strain on computer hardware resources....

Wireshark is the world’s most popular network analyzer. A network protocol analyzer is usually required to get the deepest visibility in determining network issues. Grabbing the newest Wireshark release for Windows and Mac OS X is easy enough. You just direct your web browser to the Wireshark site to grab it. Things can be a little trickier if using Linux. The Wireshark package listed with most Linux distribution repositories is usually a version or two behind the current stable release....

I recently had an issue where I wanted to play a movie on one of my portable devices, but the file’s audio stream is encoded in the AC3 (Dolby Digital) format. But of course, the device doesn’t support AC3, so I need to convert it to a compatible format. Handbrake is my go-to tool for media file conversion, but it no longer supports output to XviD – specifically the AVI container....

I routinely google this task whenever I have to install or upgrade the VMware Tools on a Linux VM guest. I figure I would make a post for future reference. Ingredients used for this post: VMware ESX Server 4.0 Ubuntu Server 9.10 Steps Use the vSphere Client to connect to a vCenter Server or directly to an ESX host. Right-click the virtual machine and select Open Console. Log into Ubuntu with an administrative account....

This post is a guide on how to create a TFTP server for Cisco device configuration backups on Ubuntu 8.10. 1. Install atftpd. sudo apt-get install atftpd 2. Configure atftpd as a separate server and modify the tftpboot location. Modify the file with a text editor. sudo vim /etc/default/atftpd Set the configuration. USE_INETD=true -> USE_INETD=false /var/lib/tftpboot -> /srv/tftpboot Save and exit. 3. Initialize the new configuration. sudo invoke-rc.d atftpd start 4....