How to setup a Raspberry Pi Cluster with k3s and rancher You have one or more Raspberry Pi 4 1 Install Raspberry Pi OS Lite (64 Bit) with the Raspberry Pi Imag...
Netflow * NetflowAnalyse contains following information: 1 Source IP address 1 Destination IP address 1 Source port for UDP or TCP, 0 for other protocol...
(This is a Wiki, feel free to add or edit content; you just need to register.) This is disabled at the moment cause of maintainance, but will be enabled soon. Tag...
IT Security in a nutshell Through my long career as a security professional, i am still annoyed how complex and inefficient IT Security most of the time is. You h...
NIST Cybersecurity Framework This is here for referential purpose only. Whenever you need information about the NIST CSF, go to the original source! Though the Cy...
Asset Management (ID.AM) NIST CSF The data, personnel, devices, systems, and facilities that enable the organization to achieve business purposes are identified ...
(Cisco) Firewall Best Practices auf deutsch Das GUI als auch die CLI sollen gleichwertig benutzbar sein. Features, die den jeweils anderen Weg behindern sind zu v...
Security $ "A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away.": Antoine de Saint Ex...
List of IP Address Management tools (IPAM) and DNS DHCP IPAM (DDI) List of IPAM at Wikipedia commercial * QIP * Infoblox http://www.infoblox.de/de/product...
ansible configuration management Installation View installation instructions First Steps # ansible version ansible 1.6.6 Add some host to /etc/ansible/hosts a...
Here documents or heredoc Multi line message using cat #!/bin/sh cat Multi line message using cat, with tabs suppressed #!/bin/sh cat Multi line message usi...
Installation packages needed in pkgsrc How to install a usable latex with pkgsrc Install: * print/xetex * print/tex koma script * print/tex babel * p...
Raspberry Pi Zero USB Dongle How to setup a Raspberry Pi Zero as a easy to use Linux Accessory. Links: * https://www.youtube.com/watch?v=IR6sDcKo3V8 * http...
Wie man die Digitalisierung trotz Digitalministerium schaffen kann Ich meine mit Digitalisierung zunächst die Digitalisierung der internen Abläufe der Bundesbehör...
Problem with NTP queries from Windows as peer wir hatten letztens einen Ausfall in der AD, nachdem die Zeitserver (NTP1 NTP6) einen Patch bekommen haben. Der P...
work in progress DDI Konzept Dies soll ein generisches DDI Konzept sein, das als Grundlage (Blaupause) dienen kann. Es soll exemplarisch die Stichpunkte liefern,...
Miscellaneous * ResetProximAP4000 How to reset an old access point * Fun A bit more complex 'hello world' in EVERY programming language you never heard of ...
Raspberry Pi 4 with NTP, PPS, GPS und Debian bullseye Work in progress * http://www.gregledet.net/computers/building a stratum 1 ntp server with a raspberry pi...
How to plot data from ntp with gnuplot Generate some simple data with a script ./ntplog.sh /tmp/ntp.log #!/bin/bash while true do echo n `date %s` ntpq p 1...
echo Print your PATH settings in human readable format on your Linux, macOS or Unix box: echo "${PATH//:/$'\n'}" See https://cyberciti.biz/faq/howto print path va...
Conexant http://www.conexant.com Hersteller von DSL , Modem , Video und Wireless Chipsätzen (nicht nur WLAN!), der im Februar 2004 mit GlobespanVirata fusioniert...
Get ride of Pocket in Firefox 1 Edit configuration about:config 2 change extensions.pocket.enabled to false * https://www.howtogeek.com/228863/how to rem...
How can i prevent the scrollbar to jump to the clicked location? 1 Edit configuration about:config 2 add ui.scrollToClick=0 (as Number not Boolean) * htt...
PXE Install FreeBSD on Soekris net5501 dhcp tftp zfs create o mountpoint=/tftpboot zroot/tftpboot sed i '/^#tftp /s/^#//' /etc/inetd.conf /etc/rc.conf: inetd_...
Quick how to RancherOS and Rancher Waschzettel / blurb RancherOS is a very dockercentric linux OS. 1 boot iso 1 sudo passwd rancher 1 ssh rancher@ 1 ...
Zero Trust Model Instead of traditional methods such as VPNs and login credentials to establish trust and verify identity, Google relies on a “tiered access” mode...
xargs find . name "*.flac" xargs file xargs: unterminated quote find . name "*.flac" print0 xargs 0 file The print0 argument tells find to use the NULL c...
tcpdump tcpdump filter to match DHCP packets including a specific Client MAC Address: tcpdump i eth3 vvv s 1500 '((port 67 or port 68) and (udp 38:4 = 0x00cac...
Copyright This sysadmin.wiki by the contributing authors is licensed under a Creative Commons Attribution 4.0 Unported License.Permissions beyond the scope of thi...
Wireless LAN (WLAN) Grundlagen zu Wireless LAN, Standards, Sicherheit, Technik, FAQ sowie alle Chipsätze und deren Treiber. Neben der Geschichte, Tips und HowTos...
GPIO on a Banana Pi M1 with FreeBSD $ Is there any GPIO on the hardware: dmesg grep gpio $ List available GPIO pins: gpioctl lv or gpioctl f /dev/gpioc1...
ntpd build options working build options for BeagleBone Black with Linux beaglebone 3.8.13 bone70 ./configure ' prefix=/opt/ntp' ' enable all clocks' ' enable ...
GPS head for raspberry pi form Florian Täger Kurz noch ein paar Hilfreiche Details: Das PPS Signal liegt an GPIO 23 an. Auf GPIO 24 liegt das FIX Signal. LED1 hä...
reset password boot dka100.1.0.6.1 flags 0,1 System will be reset prior to boot. OpenVMS PALcode V1.88 27, Digital UNIX PALcode V1.83 22 FF.FE.FD.FC.FB.FA.F9....
Was muss man beim Aufbau eines Wireless LAN beachten? Generell ist es so, daß man ein FunkLAN testen muss theoretisch berechnen lässtsich eine Funkzelle kaum. A...
jekyll A static website generator. Create a new projekt jekyll new projektname Replace default template (minima) with your own template rm about.md index.md and...
Follow the quarterly or latest packages In file /etc/pkg/FreeBSD.conf use url: "pkg http://pkg.FreeBSD.org/${ABI}/latest", or url: "pkg http://pkg.FreeBSD.org...
FreeBSD Afterboot sshd.conf within bsdinstall shell! ssh ssh port allow root Some common best practice files create ~/CHANGES # logfile for every major...
add user via batchfile adduser f user.list G wheel w no piest:2001:::::Stephan :: engk:2002:::::Engel:: grea:2003:::::Andreas:: tihar:2004:::::Tim:: seej:2005:...
Ubuntu bind is compiled with built with ' prefix=/usr' ' mandir=/usr/share/man' ' infodir=/usr/share/info' ' sysconfdir=/etc/bind' ' localstatedir=/var' ' enable ...
# bind soll konfig neu laden rndc reload # virtuelle Fenster aufmachen screen CTRL A A zusaetzliches Fenster aufmachen CTRL A SPACE zwischen den Fenstern wechseln...
Headline What is the best way to remove all packages and start over? 1 Update the ports tree. 2 Run pkg_delete pkg_delete a 3 Back up /usr/local/etc/ ...
Review the post install message Sometimes you miss something in the post install message, after installing a package. pkg install cde Review the post install mess...
Correct resolution in VirtualBox I have to set the correct resolution in the config. I was fixed to a 640x480 resolution. With xrandr i can view the possible reso...
How to access packages or updates through a proxy setenv HTTP_PROXY http://10.130.65.2:3128/ setenv HTTPS_PROXY https://10.130.65.2:3128/ cvs q z2 " d:pserver;p...
FreeBSD example commands Work in Progress tmux virtual terminal similar to screen tmux ctrl b d tmux a ctrl b c ctrl b n https://tmuxcheatsheet.com Temperatur...
# Example /opt/pkg/etc/mk.conf file produced by bootstrap pkgsrc # Donnerstag, 16. Januar 2014, 22:08:52 Uhr CET .ifdef BSD_PKG_MK # begin pkgsrc settings P...
How to setup Mac OS X Terminal * Make sure you choose xterm not vt100 in Profiles Advanced Terminfo display colors * Disable Allow Mouse Reporting in Me...
99 Bottles of Beer $ This Website holds a collection of the Song 99 Bottles of Beer programmed in 1500 different programming languages: http://www.99 bottles o...
Howto reset a Proxim AccessPoint 4000 Orinico 1 Switch on 2 push reset for 13 seconds (not too much longer) 3 If you have a DHCP Server the AP will fetch...
multitail The program multitail lets you view one or multiple files like the original tail program. multitail ci green httpd access.log ci yellow I httpd...
Reichweiten mit Wireless LAN Die Reichweite hängt stark von den Räumlichkeiten, den Antennen und der Sendeleistung ab. Grundsätzlich breiten sich im verwendeten F...
Powerline Communication (PLC) Powerline kann eine sinnvolle Alternative zu WirelessLAN sein, wenn man zwei oder mehr Rechner quer durch ein Haus verbinden will. P...
how to secure ntpd In the ntp.conf restrict default limited kod nomodify notrap nopeer restrict 6 default limited kod nomodify notrap nopeer restrict 127.0.0.1 r...
GPS Time Signal Trimble SVeeSix CM3 This auction is for a Trimble SVeeSix CM 3 OEM Embedded (Core Module) GPS Receiver and miniature OEM antenna. It is guarantee...
Example config for Meinberg Clocks ETXMGX/SHS BGT V4.59 # * lantime * # NTP.CONF for GPS167 with UNI ERLANGEN (do not modify) server 127.0.0.1 minpoll 4 max...
The Kiss of Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more pr...
More restrictive setup for MySQL Create user CREATE USER 'username'@'localhost' IDENTIFIED BY ' 8hsdg'; Create database with utf 8 CREATE DATABASE dbname CHARACTE...
Initial setup for wordpress Login mysql u root p Create database create database wp_example_com; Create user CREATE USER 'wp_user'@'localhost' IDENTIFIED BY 'se...
Difference between ntp and ptp * https://www.eecis.udel.edu/~mills/ptp.html * http://www.fsmlabs.com/news/2012/06/28/choosing between ptp and ntp.html * ...
ntp DO NOT EDIT THIS FILE IS FOR HISTORIC REVIEW * EnterpriseTimeServer * EasyDistributeAndBalanceWithPool Difference between ntp and ptp * https://ww...
How to easily configure and balance several ntp server with the pool directive Use one pool directive in your ntp.conf and you are ready. pool 0.DE.pool.ntp.org i...
Anfänge des Wireless LAN Die aus Österreich stammende Schauspielerin Hedy Lamarr und der Musiker George Antheil erfanden 'Frequency Hopping' und erhielten dafür 1...
I had Problems to connect my smtp Server I got the error message Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" I have a Telecom Connection with a...
How to view lastlog Just type lastlog Don't be confused /var/log/lastlog is a sparse file, which seems to be bigger than is actually is. # ls lh lastlog rw r r ...
Enterprise Time Server In a datacenter you need a reliable exact time source. Normally you habe one or several ntp server (ntpd) dirctly connected to a time norma...
BeagleBoneBlack with Adafruit Ultimate GPS Breakout WORKINPROGRESS I like to run a SoC with a GPS and PPS as a primary source for ntpd. I choose BeagleBone Black ...
Enterprise Wireless LAN WLAN Controller * CiscoWLC BAUSTELLE Einsatz im Enterprise Bereich HotSpots (One Button Hotspots, Coffee Shops, Flughafen, public Are...
Best Practices in Server Administration WORK IN PROGRESS Keep it small simple 1 keep some basic information in a README file on the machine 1 keep last c...
Disable ICMP Router Discovery (RDISC) Protocol Sometimes i get M...in in.routed 378 : ID 557510 daemon.error request of bad length (25) from 205.209.148.125 M....
Policy based routing 1 echo 200 custom /etc/iproute2/rt_tables 1 edit /etc/network/interfaces # The loopback network interface auto lo iface lo inet loop...
Setting up Solaris like boot environments on FreeBSD This is a interesting page only available form google cache: https://webcache.googleusercontent.com/search?q=...
# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help driftfile /var/lib/ntp/ntp.drift # Enable this if you want statistics to be logged. statsdir /va...
EIRP Equivalent isotropically radiated power FAQ Was ist E.I.R.P? Die EIRP (Effective Isotropic Radiated Power) gibt an, mit welcher Sendeleistung man eine in all...
Sendeleistung Die meisten Wireless LAN Karten senden mit ca. 30 mW. Das ist ungefähr die Leistung, mit der im 2,4GHz ISM Band gesendet werden darf. Technisch aus...
Wireless LAN mit Mac OS X Macs haben seit 1999 fast alle standardmässig Wireless LAN integriert, daher ist Wireless LAN an sich kein Problem. Hier geht es dann eh...
Sicherheit im Wireless LAN Der Betrieb eines offenen WLANs kann problematisch sein, weil Unbekannte das Netz missbrauchen können. Nach einem aktuellen Urteil könn...
Innenleben einer Cisco Wireless PCMCIA Karte Zuerst die Karte im Normalzustand: Mit reversibel abgehobenen Aufkleber. Man beachte den Unterbrecher für die eine...
WLAN Grundlagen Allgemein Wireless LAN ist eine Funktechnik im 2,4 GHz oder 5 GHz Band zur Übertragung von Computerdaten. Es ist eine Netzwerktechnik, die nac...
Software Packages for Solaris There are several famous free software archives for Solaris: * Sunfreeware * Blastwave * openCSW a fork of Blastwave * p...
How to connect as root to user screen The unprivileged user is running screen and the admin (root) likes to help i.e. connects to the user screen su joe c "scrip...
LaTeX / XeLaTeX Installation Usage komascript TODO Example invoice Mit Logo TODO OpenType font / Schrift Easy money transfer with QR Code / Einfache Überwei...
mtree mtree as a tripwire replacement With more you can extract several file system parameters and compare it later on with your files. You can use it to build a...
How to use a Mac OS X Server as a cache for Software Updates Unmanaged clients Use these steps to point client Macs that aren't managed with a configuration prof...
Since Yosemite there is a cool renaming feature in MAC OS X How to easily batch or bulk rename files with cool feature in Finder. 1 Select several files in the...
How to find (and delete) empty directories with command line tools You can use the standard CLI tool find. find . type d empty print and if you like to delete ...
Copy Paste without style or format Did you copy paste through a editor to avoid the formating in the new document? Here's a solution for you * http://www.macob...
The Satellite (EfficientIP Server Package) is not reachable anymore (timeout) Problem After an upgrade of Apache 2 (Apache/2.4.2) the Satellite is not fully sync...
How to make a bootable USB Stick with El Captain 1 Download der OS X El Capitan installer into the Application folder via App Store. The installer will remove ...
badly formatted man pages under solaris WORK IN PROGRESS man pages of non solaris software is sometimes badly formatted, because the solaris nroff use limited mac...
Spezialanwendungen für Wireless LAN Telemetrie Unter Telemetrie versteht man meistens Datenfunk mit einer guten Reichweite/Abddeckung und kleinem Durchsatz. Waru...
Enable telnet Switch#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#username admin privilege 15 password 0 admin...
How to Reset a Cisco Catalyst 3550 / 3560 Switch to Factory Defaults in privileged mode: (#) delete flash:vlan.dat Switch#delete flash:vlan.dat Delete filename ...
curl Download a file (wget replacement) curl OL http://example.com/foo.tgz View the HTML Header curl IsS http://s2p.de/Sysadmin/WebHome Check if apache can g...
perl Check if a module is installed * http://stackoverflow.com/questions/1039107/how can i check if a perl module is installed on my system from the command l...
Howto Upgrade Solaris x86 and Sparc with Live Upgrade and pca pca is one of the best update utilities for Solaris. Live Upgrade ist the best and recommended way t...
How to install Check_MK Agent for Solaris Prerequisits * libgcc * libstatgrab * top Easy to install via pkgsrc Download Check_MK Agent (shell script) ...
$ telnet localhost 6556 Trying 127.0.0.1... Connected to localhost. Escape character is '^ '. Version: 1.2.6p11 AgentOS: solaris /usr/lib/libc/libc_hwcap1.s...
How to rotate log files on Solaris with logged * http://www.cyber tec.org/2014/10/08/using logadm, a powerful log rotation tool/ * http://docs.oracle.com/cd...
Datenkommunikation mit LEDs Forscher am Boston University's College haben ein Konzept erarbeitet, wie die Datenübertragung in einem Büro mit LEDs, die an der Dec...
HiperLAN/2 Dieser an sich sehr ausgeklügelte Standard hat sich nicht gegen 802.11a durchgesetzt. HiperLAN/2 ist das Video2000 des WirelessLAN! * Frequenzbereic...
How to query the bind version dig chaos txt version.bind @10.23.45.67 TXT "9.4.1" Intro By default BIND DNS reveals the version number when queried ...
metasploit ms08_067_netapi on Windows 2000 Some nmap investigations beforehand We like to find the exact version of the operating system. nmap Pn script smb os...
Who is Who in Wireless LAN Hersteller, Behörden und Organisationen im Bereich Wireless LAN { WirelessLAN } * 3Com IEEE 802.11g * 4P Mobile Data Processin...