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[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 decide to try running it in a kind of NFV way. Now I am indeed running OPNSense as a virtual machine (with KVM as hypervisor […]

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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 reason to do that is to give the opportunity to arrange topologies between routers running as KVM guests connected using trunks instead of physical (virtual) […]

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GNS3 - RIP and RIPng TCP/IP Volume 1 Topology

[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 Volume 1, Chapter 6. As always, let me provide you with the topology picture: This time the picture is also showing what are the configurations […]

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[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 answer today is: you are given a network and you are asked to find a netmask so that you will have a defined number of […]

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[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: first, have my own local domain and, second, use it as DNS cache. In this ways I can recall my local servers/devices using their assigned […]

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GNS3 802.1x Topology

[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 port-based 802.1X authentication over a wired connection having a Windows Server 2012 configured as AD, DHCP and NPS/Radius, a switch running on IOU Layer 2 […]

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