In part 1 I went over the basics of failover. The problem with such a setup is that TCP connections will not survive a failover from ar0 to ar1, or vice versa. The main issue is that both routers have a different WAN IP, and in this case, seamless failover will never work.

Many corporate networks implement router redundancy for obvious reasons. Most of them are probably using very expensive hardware with proprietary protocols, but in fact it is possible to build such a setup for less than EUR100 and use it at home. Just get a couple of cheap routers that are well supported by LEDE/OpenWrt.

This is something that has been bothering me for a long time. I use the same SSID for both my 2.4GHz and 5GHz networks, so that clients can roam from one network to another. However, in this setup, the client decides what network it think will work best. And unfortunately, most clients just suck at making this decision.

Recently I finally bought some Z-Wave equipment:

• Aeon Labs Z-Stick Gen5
• Aeon Labs Z-Wave LED Bulb with RGBW (2x)
• Fibaro Door/Window Sensor
• Fibaro Wall Plug (4x)

I've looked at several Open Source Home Automation projects before, but so far the only one that is, in my opinion, lightweight enough to run on embedded hardware is Domoticz. It's also relatively easy to configure. Can't say the same of OpenHAB, for example.

We all know them: brute force attacks. Be it SSH, SMTP, IMAP, your favorite web application, ... they happen. And they happen all the time.