Secure private network

To secure the private home network, especially create a guest network and a private one, I used raspberry pi. The private network must be protected better, because of devices like computer, NAS, ect… . The raspberry is equipped with an additional lan port (usb to lan) and an additional w-lan card for a better signal. The first lan port is connected with the router of the ISP and the second one with the local private network. After that the routing is made (IP Tables) so that the internet is forwarded to the private network. Then the firewall (ufw - uncomplicated firewall) is configured, per default all connections are denied and the needed ports have to be opened after that. For example 80 and 443 for http and https. After that a proxy is installed, in this case pihole for blocking adds and additional IPS (intrusion prevention system) Fail2Ban is installed and configured, to secure the „Firewall“ even more.

TPLink Powerline Adapter loosing connection

This is a common problem when these types of Powerline Adapters switch to the power-savings mode. There are tools where the power-savings mode can be disabled. They prevent the device from switching into power-savings mode, which causes the loss of the network connection.

Download one of those tools (,, one of them should be able to detect your device when connected via an ethernet cable, depending on your specific model of the TPLink Powerline adapter. When detected, disable the power savings mode with the tool for all your devices. The loss of your connection should not occur anymore.


Disable and reenable WiFi network

1. Right click on Networks.
2. Click "Open Network and Sharing center resources".
3. Click "Change adapter settings".
4. Disable and enable WiFi network.


Using PowerLan to get access to the router (and the internet)

Imagine a flat where the router is located in the living room. Now you want to get access to the internet from the office room with your notebook via your router. But: <ul> <li>the office room is several meters and 2 rooms away</li> <li>the wlan signal can't get through the walls and </li> <li>you can't put an ethernet cable from the router all the way through your flat to the office room</li> </ul> How can you manage it to still get access to the internet via your router?

Share files in a Linux Network

Sometimes you want to share files in linux via network. Windows has the file sharing mechanism since Windows 98 or so. Whats there on Linux.

MPLS (multiprotocol lable switching)

VPN (virtuell private network) with MPLS (multiprotocol lable switching). MPLS is a data-carrying mechanism in telecommunication networks that transfers data from one station (network node) to another. Instead of using long network addresses, short path lables are used. The labels identify virtual links between the stations. The main benefit of this mechanism is to avoid dependence on a particular data link layer technology. It can be used to carry many different kinds of traffic.
MPLS can be ordered from any provider.

Secure online file transfer

An organisation is build up as follows: one headquater, whiche is technically well equipped and 6 to 8 sub-offices spread all over Austria, each with one or two personal computers. The headquater has a server which is regularly serviced and backed. On this server are all datafiles required. All sub-offices but no third party should have access to this data bases.


Access your computer over internet in a secure way

Accessing you own data is getting more and more important. Part of it is already accessible from "everywhere", when stored with your emails. But "the cloud" is not that advanced yet and so there are documents you only have on your computer. Imagine you switch place for a couple of days, and still want to be able to look something up. One possibility was to create a backup and store all documents you might need on an external drive - a tedious process, and will forget the <em>one important</em> document. You could also open a port for Windows' Remote Desktop connection, but for security reasons this is not a choice. There should be a secure way to access the data.

Capturing network traffic with Python

<p> It is necessary to capture the traffic on a specific network-interface between a server and a client. Most of the messages can be ignored, but some of them should be filtered and evaluated.<br /> This depends on the message-body. </p> <p> Other requirements: <li>The network-interface should be choosable from a list of all available devices.<li>The body should be readable by a human-beings. <li>only SYN-Packages, no ACKs<li>specific IP-Adresses </p> It should run on Linux.

distribute firewall settings

<p>In networks of Windows workstations whether at home or at work you might want to use same settings and exceptions of the windows firewall on different workstations and not enter same settings on each pc over and over again. Some application or services need several ports to be opened to function correct. What are possibilities to distribute these carefully defined settings on several workstations?</p>


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