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Author: palo73

How to install Microsoft Loopback Adapter on Windows 11

To install the Microsoft loopback adapter on MS Win 11 OS you must:

  1. Right-click on the window start menu icon and select Device Manager. The Device manager window will immediately open (or you may use any other way to open the device manager window)
  2. Left-click on Action, and select Add legacy hardware. The Add Hardware wizard will start.
  3. Click Next on its Welcome screen.
  4. Choose “Install the hardware that I manually select from a list” and click on Next
  5. Scroll down and select Network adapters from offered common hardware types and click on the Next button.
  6. Select Microsoft (not Microsoft Corporation|as the manufacturer, and then select Microsoft KM-TEST Loopback Adapter card model, click on the Next.
  7. Click on the Next
  8. Click on the Finish.

Setting LAN network with three VLANs on Mikrotik RouterOS switch and Cisco IOS router on-stick.

In this article, I will set up a simple LAN network consisting of two PCs, one Mikrotik box that acts as a L2 LAN switch, and one Cisco router that connects everything to the internet using NAT. PCs and Mikrotik switch are in the separate VirtualLANs (VLANs). My VLAN definition is:

  • VLAN10, name Home, network address:, Mikrotik port: Ether 2
  • VLAN20, name IoT, network address:, Mikrotik port: Ether 3
  • VLAN99, name MGMT, network address:, Mikrotik port: bridge
  • Ether port 1 will act as the trunk

Devices addresses:

Setting a simple LAN network with Mikrotik RouterOS and Cisco IOS

In this article, as the RouterOS CLI newbie, I will set up a simple LAN network consisting of two PCs, one Mikrotik box that acts as a simple L2 LAN switch, and one Cisco router that connects everything to the internet using NAT. All four devices are in the same broadcast domain and have IP addresses from the network address space :

Devices addresses:

GNS3 – How to change the Solar-PuTTY font size

To change the Solar-Putty font size follow these steps:

  1. Open the Solar-Putty SSH client (for example by opening the console of a GNS3 device)
  2. Click on three dots in the upper left corner
  3. Select Settings,
  4. Go to the bottom menu item “GENERAL
  5. Look at the bottom of the window for “FONTS & COLORS”
  6. Click on the “Launch Putty” link. As the result the Putty configuration window will be opened
  7. Click on the Default settings inside the Saved sessions
  8. At the left menu select Window => Appearance
  9. Click on the Change button and set your preferred font and its size. When you will finish click on Ok.
  10. At the left menu select “Sessions” and “Default settings” again
  11. Click on Save
  12. You may close the window now. It is done!

Here are screenshots:

CCNA study – How to configure multiple IPv6 DHCP pools on a remote Cisco router

This config example shows how to configure three DHCPv6 pools for a network setup, where the DHCP server is running on a remote router. This situation had emerged during my remote CCNA lesson and it found me unprepared. The main problem is with the ipv6 dhcp server POOL command, that can be executed only once, all others rewrite the previous one. The solution is to use ipv6 dhcp server automatic or just pv6 dhcp server command with some additional pool command.


Configuration runs on GNS3 emulator. The Switch runs IOSv and is primarily used for the VLAN segmentation. In R1/R2 I’m using the older ISR platform (7200 15.4 IOS). CSR-1000v is also fine. Problems are with older 12.x IOSs, that do not support ipv6 dhcp server command. DHCPv6 servers/pools are configured on R2. DHCPv6 relay and nd config flags on R1 fa0/0 subinterfaces.

Netacad Packet tracer – how to activate Security feature for Cisco IOS and VPN labs

Cisco Packet Tracer (PT) simulator allows performing site-to-site VPN exercises. However, the security feature of the router’s IOSs is disabled by default and has to be enabled. Then required VPN commands (crypto and etc.) will be available. The activation is quite simple and functionality was tested for PT versions 7.3 and 8.0.1:

  1. Start the packet tracer and place an 1841/1941 router on a workspace or open an existing project that is using such routers

2. Open CLI and type show version. We may see that the security feature is not activated:

IOS XRv – no network interfaces in GNS3

A few words about the setup. We operate a remote GNS3 server setup, where all components (server even clients) are version 2.2.25. The remote server is deployed in a Linux container.


We operate several IOS XRv 9k appliances that were in default state default during the import process. We notice the following problem. Running small topos with an IOS XRv, once the router is loaded it had no network interfaces.

How to install DIG dns tool on windows 11

This guide explains how to install the dig dns tool on windows 11 in a few steps. It is just a little bit modified version of How to install DIG dns tool on windows 10 howtos.

1. First download the latest Bind9 executable for Windows. All ISC software is available at However, there is a message, that the latest win executable is 9.6.23, which we may download from the link 9.16.23.