zerotier

ZeroTier’s software is open source and free to use for most purposes including personal useinternal use within a business or academic institution, and evaluation for uses that require commercial licensing.

https://www.zerotier.com/pricing/

Roberts RM33 Raspberry Pi Internet Radio (Yet Another…)

https://www.instructables.com/id/Roberts-RM33-Raspberry-Pi-Internet-Radio-Yet-Anoth

LFCE: Advanced Linux Networking

https://app.pluralsight.com/library/courses/linux-networking-advanced-lfce/table-of-contents

Freeware library to create Excel files

https://github.com/dotnetcore/NPOI

How To Install and Configure OpenVPN On Your DD-WRT Router

https://www.howtogeek.com/64433/how-to-install-and-configure-openvpn-on-your-dd-wrt-router/

Installing OpenVPN client and server on a DD-WRT router

How to install OpenVPN on Ubuntu 16.04

Open Port Check Tool

https://networkappers.com/tools/open-port-checker

 

https://www.yougetsignal.com/tools/open-ports/

An In-Depth Guide to iptables, the Linux Firewall

This is a great guide to iptables:

An In-Depth Guide to iptables, the Linux Firewall

An easy way to generate a self-signed certificate online

You can generate a self-signed certificate online here:

http://www.selfsignedcertificate.com/

This will generate a two files – a certificate and a key.

If you are using IIS server you need to convert these to .pfx. For this you can use the SSL Converter here:

https://www.sslshopper.com/ssl-converter.html

Free SSL certificate from StartSSL

If you own a web site and would like to provide better security to your visitors in terms of encrypted communication between your server and their browser you need to install a SSL Certificate. You can get a certificate from different companies and the price can vary.

The StartSSL