cisco switches are basically computers with their own os that has an interactive cli (terminal, bash) this is how to show the switch_id, the switch with the lowest switch_id is the root bridge-switch. Switch>enable Switch#show spa Switch#show spanning-tree VLAN0001 Spanning […]
requirements: make sure ssh public key auth works without password: pcA -> pcB, and pcB -> pcC pcB = “jumphost” # in general pcA <—-> pcB <—- pcC (x11vnc) # yes it’s kind of a weird syntax X-D ssh -L […]
hostnamectl; # tested on Static hostname: workstation Operating System: Debian GNU/Linux 13 (trixie) Kernel: Linux 6.12.30-amd64 Architecture: x86-64 # theoretical lowest possible value 0 (highest priority) and highest possible value 4294967295 (hex 0xffffffff, guint32 (unsigned 32-bit integer, lowest priority) for […]
WARNING! WORDPRESS DISPLAYS ONE-LINER-COMMANDS IN MULTIPLE LINES MAKE SURE TO ALWAYS COPY THE WHOLE LINE! based on https://anchored.host/articles/how-to-turn-a-debian-machine-into-a-router hardware requirements: have at least 2x network interfaces LAN (internal network shielded from WAN) WAN (this is the network that connects to […]
how to install GNU Linux Debian 13 (Trixie) update: 2026-06: netplan might or might not be installed! here is how to setup fixed ip without netplan (debian 12 kind of way) also for other distros re-tested (2025-02-08) and graphical installer […]
scroll down to: “how to access user-dev-admin’s home network boxes from anywhere via reverse-ssh-tunnel! :D” ssh tunnel remote deviceD’s port access a device’s port that is only available via a specific machine 😀 or in other words: ssh-tunnel port of […]
network mac’s are used to uniquely identify systems and users and thus a privacy problem so mac randomization should be enabled per default on every distribution for every wifi network card (maybe interactively during setup ask the user to enable […]
GNU Linux howto ssh sshd config hardening security guide per default Debian (unfortunately) does not log ssh logins (why? afraid of harddisk overflows?) every user and admin wants to see “who and what is going on” the system usefull also […]
Starlink is a cost effective internet-via-satellite provider run by SpaceX at 2024-01 currently (2014-01) counts over x > 2 mio customers SpaceX plans to put 12.000 to 42.000 satellites into Low Earth Orbit (LEO). currently (2024-01) 5289 satellites (Wiki) in […]
so every android user is in a hurry to update update update to Google’s latest firmware because of it’s security issues really would like to see a smart phone that can run almost unchanged GNU Linux kernel 😀 (yes would […]
in the past, this was no issue. no matter what. neither: ifup enp0s25 # nor ifconfig enp0s25 up # nor ip link set enp0s25 up # worked two notebook NICs were connected with a known-to-be-good LAN cable but both interfaces […]
“wlx123 Interface doesn’t support scanning : Device or resource busy” this error occurs during manual terminal bash based scanning of wifi wlan networks: hostnamectl; # tested on Operating System: Debian GNU/Linux 12 (bookworm) Kernel: Linux 6.1.0-13-686-pae Architecture: x86 su – […]
forget about all other wifi adapters, get the Edimax Technology Co., Ltd EW-7612UAn V2 802.11n Wireless Adapter [Realtek RTL8192CU] as long as it’s produced… it just works out of the box on almost any GNU Linux distro including raspberry pi […]
methods for detecting network loops -> Realtek Remote Control Protocol – Loop Detect Packet – absolutley nothing wrong with it. (src) also interesting that HP switches are using a Cisco MAC address?
![GNU Linux – hardware review – Wifi WLAN USB Stick Edimax N300 (EW-7612UAn V2 802.11n Wireless Adapter [Realtek RTL8192CU]) (also works with ODROID XU4 (Armbian))](https://dwaves.de/wp-content/uploads/2022/10/Wifi-WLAN-USB-Stick-Edimax-N300-EW-7612UAn-V2-802.11n-Wireless-Adapter-Realtek-RTL8192CU-scaled.jpg)
forget about all other wifi adapters, get the Edimax Technology Co., Ltd EW-7612UAn V2 802.11n Wireless Adapter [Realtek RTL8192CU] as long as it’s produced… it just works out of the box on almost any GNU Linux distro including raspberry pi […]
software minimalism is key for stability, maintainability, security and performance so regularly check, what services are running and if they can be disabled/uninstalled 🙂 systemd: systemctl.man.txt # list all units (list can be /searched like less) systemctl # list all […]
currently wrestling with a LTE modem, that used to work under Ubuntu, but refuses to work under Debian 11. while true; do echo “=== show modem status:”; mmcli -m 1|grep -e model -e primary -e state -e signal; echo -e […]
this is a quick bash hack, to set overwrite the current ip with an fixed ip or add an virtual interface for an additional fixed ip this will (brute force) OVERWRITE all mess done by network managers of various origins […]
0) for security: keep all internet connected devices as up to date as possible! “Freifunk updates its router firmware and closes a critical security vulnerability that could allow attackers to install their own firmware on the devices” (src: heise.de) Also […]
and: is the EU / Germany location simply unattractive for many companies in view of the data protection craze? “In the end, it may be bitter for Quad9 that they only got into the trouble by moving to Europe, where […]
the specs CPU Allwinner A20,32 Bit Cortex™-A7 2-Core 1G GPU ARM® Mali400MP2 -> get the GPU going SDRAM 1GB DDR3 (shared with GPU) 432Mhz Storage “SD Card up to 64GB (SDXC) 1 SATA up to 2TB “ Network 4x Gigabit […]
the most fundamental networking settings are ever changing it used to be /etc/resolv.conf where nameservers are set systemd is doing it’s own thing /etc/systemd/resolved.conf and Ubuntu (based on Debian) is doing (again) it’s entirely own thing (netplan) frankly: this sucks […]
nfs is to GNU-Linux what smb is to Windows: sharing dirs & files “The Network File System (NFS) was developed to allow machines to mount a disk partition on a remote machine as if it were a local disk. It […]
remember that discussion about ever changing non-standard ways of defining network interfaces and ip addresses under /etc/network… well guess what, canonical just came up with a completely new config file format X-D (guess, everything is a yaml.yml now) hostnamectl; # […]
update: join me @ online-coworking-space.com https://play.workadventu.re/@/online/coworking/space.com first of: the online conferecing as RPG game format is really fun and innovative idea to make online events more fun! 🙂 (it is accompanied by live streams via vimeo or youtube) Corona will […]
can not recommend! the connection works (benchmark results below) the major problem is: unable to disable DHCP! which means: whenever there is a disconnect from the uplink (DHCP lost) the DHCP of the TL-WPA4220KIT will “kick in” and assign completely […]
update: Starlink reduced price to 80EUR! 😀 PLUS: THE HARDWARE IS FOR FREE! (the very good hardware alone is worth ~2000USD!) Thanks Elon! 😀 Support SpaceX: mankind’s only hope to ever reach Mars! order Starlink now! Update: Amazon […]
always say something positive first: FritzBoxes are great (DSL/LTE/…) internet routers (up to now) all FritzBoxes work with 12V DC (which is great for usage with small solar power stations (that are usually 12V based)) high quality & reliable secure […]