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clamav-daemon does not listen on TCP port
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ARP Flux on Linux hosts with multiple network interfaces
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"bad superblock on" and nothing works anymore
Delete logon history on Linux
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Installation of Oracle Java
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HOME
LINUX
Open Source
GRUB repair in the rescue system
One system with two default gateways
Restore passwords under Linux
Instructions for Jitsi Meet video conferencing
Possible problems and solutions
Securing Apache2.4
VPN explained in more detail
Kali Linux as a VirtualBox guest
Create shared folders with Host System
Install PHP (8.2, 7.x and 5.6) on Debian Linux 11
MyISAM or InnoDB - a comparison
DNS & BIND9
Reverse Lookup
Dig HowTo
Different dig queries
Useful informations by DIG
Dynamic DNS (DDNS)
Troubleshooting DDNS
Edit zone files
Secure BIND9 with DNSSEC
Configuration of DNSSEC
IT-SECURITY
Kali Linux - OpenVAS
SE-Linux
SELinux - Installation
GnuPG & SSL
SSL Commands
VIRTUALIZATION
KVM - Mount qcow2 image using qemu
ASTERISK PBX
HOW TO
clamav-daemon does not listen on TCP port
/var/ is extremely full
ARP Flux on Linux hosts with multiple network interfaces
Use Grub2 manually
Repair grub with live system
Download with wget
"bad superblock on" and nothing works anymore
Delete logon history on Linux
Delete the BASH history
Installation of Oracle Java
Upgrade from Debian 11 Bullseye to Debian 12 Bookworm
Install GIMP 2.10 on Debian Stretch
Create SSL certificates
Multiple SSL certificates per Apache instance
Let’s Encrypt
SSH login without password
MariaDB problem with root login
NETWORKS
Network types
Protocols
The ARP Protocol
OSI Reference Model
Physical Layer
Data Link Layer
Network Layer
Transport Layer
Session Layer
Presentation Layer
Application Layer
Port Scanning
nmap a port scanner
Most important Nmap scans
OS- and Service-Identification
Wireless LAN
802.11-Standards
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