IP multicast is an interesting technology. It’s main purpose is to save network bandwidth as much as possible – traffic is sent to hosts which asked for it only (as opposed to broadcast). On the other side, you need smarter (manageable) switches and separate and non-trivial configuration on both routers and switches. Even more complicated it is when you try to make it work over VPN. Continue reading
This weekend I was thinking how to make my webcam connected to OrangePI send a picture “on demand”. There are daemons (e.g. motion or webcam-mjpg) which do this but they capture images even when you are not watching and I wanted to avoid this. There are also projects (fswebcam) which are able to take single picture, save it to disk and end. I just needed to run it after http request and send back the image. Installing full webserver with some kind of interpreter (php, lua,…) seemed to me like an overkill. So I came to an idea to use inetd.
And this is how I did.
this post will be about my homemade IoT thermostat. The goal was to not install any cables (because I live in a rented flat), to go really cheap and to be able to set the temperature from anywhere. I’ll also give you some tips you should think about when building your own. Let’s get started.
I have an OrangePi running jernej’s OpenELEC build connected to my TV. It works very well and stable, but on the other side, you can’t do much more with it because OE is very limited Linux distribution. This is a short guide how to run standard Debian services (nginx, samba, openvpn, … anything) in Debian chroot. Continue reading
I have a favorite cheap chinese router based on RT5350 (running OpenWRT).
Recently, I was wondering, why I can’t get WiFi on a few of them working. I have one piece running quite old (4xxx svn) OpenWRT where the WiFi works OK. So I tried to compile exactly the same version and install it on the non working piece. I also put the same wifi config there but nothing. It didn’t work. Continue reading
This is how to change default SSL key size on iDRAC Dell R415 Continue reading
eID obciansky je v podstate standardny pkcs11 system. Continue reading
echo | openssl s_client -connect mail.example.sk:25 -starttls smtp | openssl x509 -noout -dates
Testing SPAM filtering from shell
echo "XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X" | mail -s Spam_test email@example.com
Disable filtering for example.com
add following lines to /etc/amavis/conf.d/50-user (don’t forget the dot before domain, it has to be there):
@bypass_spam_checks_maps = ( [".example.com"], ); @spam_lovers_maps = ( [".example.com"], );