Network
Understanding, analyzing or expanding your own network: Basics for the home network.
Set up network for home: Expand and improve your LAN / Wi-Fi
What do I need to improve Wi-Fi reception and get more network connections at the same time? Do I need a repeater, mesh Wi-Fi, access point, switch, or a router? What exactly is a router? How can I combine different devices from different manufacturers? you'll find answers to these questions. But let's take things one step at a time: In the beginning, right after the house connection, there was the modem. For those who prefer a video, the content of this article can also be accessed as a YouTube... ... continue reading
Alternative router firmware: OpenWrt and no longer DD-WRT
Router manufacturers usually provide updates for their products only for a limited period of time, often leaving security holes on older devices unpatched. One possibility to provide the hardware with an up-to-date operating system (OS) again is offered by the freely available router firmware: OpenWRT. In addition, OpenWRT can extend the functionality of the router with additional services, such as VPN, additional statistics, or when using multiple devices, with WiFi roaming, see also: Set up ne... ... continue reading
OpenWRT hardware recommendation - available devices 2022
OpenWRT provides a uniform and up-to-date software for different network devices like routers or access points and delivers countless additional setting options, software packages and functions. This makes it possible to combine new and old devices from different manufacturers and, among other things, to use low-cost hardware in a common WiFi, see: Setting up a home network: Extending LAN and WLAN | Improving. ... continue reading
Find IP addresses in the network even if their firewall is enabled
If you want to get a quick overview of all active devices in a network, you can do this with network discovery, commands in the command prompt, in PowerShell or with special IP scanners. The PowerShell commands presented at the beginning of this post give a quick overview of all devices on the local network and may make special programs for scanning the network unnecessary. For expanding your own network, see also: Set up network for home: Expand and improve your LAN / Wi-Fi. ... continue reading
cmd commands for network analysis
With simple commands a quick overview of the current network settings can be read out and thus possible connection errors can be found, or an overview of other devices in the network can be obtained. The commands described here are cmd commands for Windows. They are entered via the command prompt: cmd. ... continue reading
Ping with Port | cmd vs. PowerShell: Test-Netconnection
As is well known, the tool ping can be used to test the access to a certain network device and its response time. Not all devices will respond to a ping, but they may respond to a particular Tcp-Port if a particular network service is provided through it. Windows PowerShell allows you to test a specific port using Windows board tools. The psping tool can also measure the response time to a specific port. ... continue reading
OpenWRT - Display bandwidth of individual devices (monitor)
Most routers show an overview of all connected devices, some show a snapshot of the bandwidth used, but hardly any give an overview of the amount of data consumed over a certain period of time and certainly not by which device it was consumed. To make the consumed bandwidth a bit more transparent, I was looking for a way to historically record the bandwidth per device. The firmware of normal routers hardly offer a possibility here, differently when using an open source firmware, for example Open... ... continue reading
OpenWRT LoadBalancing - LTE backup internet line multiwan
With OpenWrt, it is possible to combine two Internet connections, which not only increases availability, but also bandwidth: In the test setup, the download and upload rates added up, the Internet connection thus becomes twice as fast and should one connection fail: the Internet simply continues to function over the remaining connection. ... continue reading
LAN / WiFi Speed Test: Test network speed with iPerf
To measure the speed in your own network, you can use the free command line tool "iPerf". Two devices are needed for the speed test. One to start the server mode, another to connect to the server in client mode. The output of the actual measured speed between the two devices appears on both the server and the client. ... continue reading
delete automatic redirect to https in Chrome: localhost
When calling a test page without HTTPS on localhost I recently had the following phenomenon: http://localhost was redirected to https://localhost: The test page could no longer be displayed. ... continue reading
The best browser: Google Chrome and Blink vs. Firefox
The browser is playing an increasingly important role. In addition to its original purpose, the presentation of static content, multimedia content or applications can now be consumed via the browser. ... continue reading
Wi-Fi in the area: view and find the best Wi-Fi channel
If there are several WLAN networks in the vicinity, they may influence each other. For maximum speed and stability, your own WLAN should preferably use a Wifi channel that is not used by any other. I have summarized general information on how to expand your own network in a previous article: Set up network for home: Expand and improve your LAN / WiFi. ... continue reading
call localhost: IP address "127.0.0.1", "::1" | what is localhost?
If the computer were a house, “localhost” would be something like “home”. In a nutshell, “localhost” is the network name for your own device: for itself. ... continue reading
block certain websites: redirect websites
When a web page is called up, the domain part of the URL is first converted into an IP address. Responsible for this is the name resolution: DNS. The domain entries contained in the hosts file have priority and are not, as conventionally, queried at the DNS (which IP address has the domain ...). ... continue reading
Show WLAN users: connected devices
To find out which devices are currently connected to your WLAN, they can be displayed via the router or a network scan. ... continue reading
Testing the Internet: availability - stability, disruption?
More important than the speed of an Internet connection is its availability. If the Internet line does not run stably, this can have several causes. The basis for the connection is of course provided by the provider, who guarantees his customers the highest possible availability. If you operate a router, switch or other devices in your home network, you expand the circle of possible sources of error to include the corresponding devices. In addition, the availability for the individual end device... ... continue reading
WebPush: A page wants to send you notifications
Apps have been able to do this for a long time, but the ability for websites to send notifications is somewhat newer. With the help of WebPush, users can be actively notified even if they are no longer on the corresponding website. The only requirement is that the browser is open. ... continue reading
Anonymous and unknown on the Internet: Incognito vs. VPN vs. Tor
If you really want to be private on the Internet, you should not rely on incognito mode. ... continue reading
show own public IP - what is my IP address?
Find out the current IP address on the Internet When accessing this website, this IP address is used on the part of the client. ... continue reading
show active network connections and processes | Windows
For a quick overview of which programs or services have an active network connection, they can be listed via simple commands or monitored and analyzed via specific tools. ... continue reading
cmd Portscan - Test devices on the network for their services.
Network devices use specific network ports for communication. As an example, port 80 or 443 is used to call up a web page of a web server. In order to establish a connection with a web server, it listens on the corresponding port, in the case of a web server on 443. Theoretically, any port could be used by the web server operator for establishing a connection, nevertheless, port numbers are standardized and certain numbers should be used for certain protocols, such as port 80 for unencrypted web... ... continue reading
WiFi and LAN network cable simultaneously - Internet access
What actually happens when WiFi and the network cable are connected at the same time? The routing table provides the answer to this question. By adjusting the routing or the metric in the TCP/IP settings of the adapters, the desired behavior can be set. If you want to see the settings noted here in action, you can do so in a short video. ... continue reading
Webhosting
Since the start in 2003, not only this site has changed a lot, but also the technical possibilities when hosting a website.Originally I started with a small webspace, later I rented a virtual server with Plesk, and today I run the website in simple Docker containers.Today there are certainly much more options for running a website than back then, which on the one hand simplifies the operation on the other hand there are also new requirements for a website today. However, the topics described he...