How often have you looked for a secondary device to keep it connected to a network for packet analysis and troubleshooting? Sounds familiar? Yes, we all have the same problems! Let’s utilize a Raspberry Pi 4 and an external disk drive to make a DIY plug-and-play Network Tap.
Among the numerous Note taking applications Joplin is the one I prefer to use on my daily basis. In this guide you can learn how to set up a Joplin Server on a Raspberry PI to sync your notes across different devices.
Many guides exist describing how to flash a CC2531 USB adapter using a Raspberry Pi instead of a CC debugger. The problem with almost all of those guides is that they are outdated and don’t work on newer devices (specifically with 64 bit architecture). Most of the times the issues have to do with outdated version of wiring PI, or the precompiled for 32 bit devices cc_* binaries (cc_chipid, cc_read, cc_write). In this guide you will learn how to flash CC2531 using a Raspberry PI 4 or any other device with 64 bit architecture OS.
Today I read this official document (published on September of 2022) which describes how to change the MAC Address of Raspberry PI Devices. Interestingly it describes a different method for Raspberry Pi 4, 400 and CM 4 by editing the EEPROM configuration, using the following command:
sudo -E rpi-eeprom-config --editIn the configuration file append a new line with the required MAC Address as follows:
MAC_ADDRESS=aa:bb:cc:dd:ee:ffSave the new configuration (Use Ctrl + X to stop editing, Y to overwrite current file and ENTER to confirm). Upon saving the following message appears:
Finally, reboot your device in order to apply the new MAC Address. Warning If the device gets IP from a DHCP server, then most probably after the reboot it will be assigned with a new IP address.
This is a different (and simpler) technique from the one which I described in a previous post (which works for all models)
BYOPM is a portable Password Manager implementation based on VaultWarden, an unofficial implementation of BitWarden and a Raspberry PI Zero. It’s a self hosted solution, with full functionality, which is activated by just plugging the device on your computer. Bitwarden’s Official browser addons and extensions are also supported, and the device has been tested both on Windows (10 and 11) and Linux (Debian Based).
This is how to enable Home Assistant’s SMS Integration Service using the Geetech Arduino GPRS Shield (based on the SIMCom SIM900 module) on a Raspberry PI 4 over serial communication. The host system is using Home Assistant Supervised which was deployed in docker.
Continue reading Integrating serial GSM Modem with Home Assistant
Every operating system, has a way to mount file systems from devices or image files and include them in the file system. Under Linux the mount command instructs the operating system for an existing file system and associates it with a particular mount directory. Using the offset parameter of the mount command it’s possible to mount a Raspberry PI image to a directory and interact with it.
Updated 14/04/2021
Thin Clients, are computers which are optimized to establish a remote connection to a server and run using the remote resources. Usually those systems are not meant to be used for intensive tasks or gaming and they are mostly found in office environments. In the following guide you will find out how to use a Raspberry PI to connect to a local Windows Computer using Microsoft’s RDP Protocol.
Every version of Microsoft Windows following the release of Windows XP includes a Remote Desktop Connection (RDC) client (mstsc.exe). The Remote Desktop Connection is accomplished through the Client using the Remote Desktop Protocol a proprietary Microsoft Protocol which provides a graphical interface to connect to another computer.
MAC Addresses are unique for each Network Interface Controller (NIC) and most often are not configurable. Taking advantage of this fact in combination with the Organizationally Unique Identifier(OUI), many Network scanners use the MAC Address in order to determine the manufacturer of a Network Device or even the device type. As you can read in RFC 7042:
48-bit MAC "addresses" are the most commonly used Ethernet interface identifiers. Those that are globally unique are also called EUI-48 identifiers. An EUI-48 is structured into an initial 3-octet OUI and an additional 3 octets assigned by the OUI holder or into a larger initial prefix assigned to an organization and a shorter sequence of additional bits so as to add up to 48 bits in total.
Here you can find a complete list of the registered OUIs from IEEE and here the Wireshark OUI Lookup tool.
There are many tutorials explaining how to set up your Raspberry PI as a Serial Device. Almost all of those tutorials explain how to setup your Raspberry as a Serial Console, which will act similar to a SSH connection. The current tutorial takes a different approach. You will find out how to turn your Raspi to a Serial USB Gadget, and how to control what you redirect to the Gadget’s Serial port in order to be available to the machine it will connect to. Using socat, commands we will redirect Serial data received over IP to the Gadget Serial port or data from the on-board UART protocol to the Gadget port.