please post some ideas on which article you would like to see in my next networking article.

You could try to follow up with the one you just had posted sying how to install a Router go on with firewalls and perhaps also mention it's a quite viable choice to use an old machine with a Linux distro for it than buy a hardware router/firewall...

Though I'm not sure how high-level you want to go with those articles and I'm not the one that really should recommend you in any or the other direction...