[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…
[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…
[Networking] Alternatives to packet tracer (was: Softwares to build a virtual lab)
Maybe this article will not bring to your knowledge something new, but it happened to me in the recent past that not all the friends and collegues I was talking…
[Networking – LAB] Basic MPLS topology
While reviewing MPLS topics you can't avoid to try how the technology works doing some labs. This is particularly valid if you don't have the opportunity to "touch" the technology…
[Networking – LAB] OSPF, get familiar with LSA types and AREAs
I am always reviewing Routing topics to have them all the time fresh in my mind, especially when I don't practice with them a lot during daily works. This time…
[Networking – LAB] DMVPN GNS3 preconfigured lab for Yasser Auda Workbook
As promised in my recent post about DMVPN online and free study resources, I prepared a small topology for a Laboratory that helps you practising with DMVPN. The topology is…
[Networking] DMVPN – Online study resources
This is a very quick post to provide some documents to read and study if you are interested in learning DMVPN technology. I added a very short comment for each…
[Networking – LAB] Simple GRE Tunnel + IpSEC on Cisco router
Today I was reviewing GRE tunnels and their interaction with IpSEC and I decided to create a very simple and small Lab in GNS3 to have a little bit of…