[dmourati]

The best place to do this is at your border. You probably have a cable modem or router or some such that connects your home to the internet. You would typically install software known as IDS (Intrusion Detection System) such as Snort there and look for anomalous traffic.

As for a non-technical solution, it will be difficult to implement. It requires some computer know how and time. Such a secure device could be created or better yet offered by the manufacturers of the modems/routers frequently deployed in homes.

[pmlnr]

The last time I played around with Snort[1] I realized I'm lightyears away from being paranoid compared to the default settings :)

It would be good to have an IDS with bare minimum settings, easy to turn on layer after layer, though I understand it's tricky.

[1]: https://www.snort.org/