With LibreOffice Draw, you can make network diagram just like you did with Visio (or GNS3 or even Cisco Packet Tracer). The problem is that icons for networking, such as server, router, firewall, workstation, cloud, etc. are not included by default. Fortunately, the solution is you can add such icons as plugins in Draw and then use it to make diagram.  Thanks to the awesome VRT project, now we have it on LibreOffice. This tutorial explains step by step to install VRT extension into LibreOffice Draw until you can see networking icons available. Enjoy!

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