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LINUX
Open Source
GRUB repair in the rescue system
ARP Flux on Linux hosts with multiple network interfaces
One system with two default gateways
Restore passwords under Linux
KVM - Mount qcow2 image using qemu
Secure BIND9 with DNSSEC
Configuration of DNSSEC
Dig HowTo
Different dig queries
Useful informations by DIG
Dynamic DNS (DDNS)
Troubleshooting DDNS
Edit zone files
Instructions for Jitsi Meet video conferencing
Possible problems and solutions
Securing Apache2.4
/var/ is extremely full
VPN explained in more detail
Kali Linux as a VirtualBox guest
Create shared folders with Host System
Kali Linux - OpenVAS
Install PHP (8.2, 7.x and 5.6) on Debian Linux 11
MyISAM or InnoDB - a comparison
SELinux
SELinux - Installation
ASTERISK PBX
TUTORIALS
clamav-daemon does not listen on TCP port
Use Grub2 manually
Repair grub with live system
[Translate to Englisch:] Ermittlung der internen CPUs
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
GNUPG SSL
SSL Commands
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
BLOG
IT-SUPPORT
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LINUX
Open Source
GRUB repair in the rescue system
ARP Flux on Linux hosts with multiple network interfaces
One system with two default gateways
Restore passwords under Linux
KVM - Mount qcow2 image using qemu
Secure BIND9 with DNSSEC
Configuration of DNSSEC
Dig HowTo
Different dig queries
Useful informations by DIG
Dynamic DNS (DDNS)
Troubleshooting DDNS
Edit zone files
Instructions for Jitsi Meet video conferencing
Possible problems and solutions
Securing Apache2.4
/var/ is extremely full
VPN explained in more detail
Kali Linux as a VirtualBox guest
Create shared folders with Host System
Kali Linux - OpenVAS
Install PHP (8.2, 7.x and 5.6) on Debian Linux 11
MyISAM or InnoDB - a comparison
SELinux
SELinux - Installation
ASTERISK PBX
TUTORIALS
clamav-daemon does not listen on TCP port
Use Grub2 manually
Repair grub with live system
[Translate to Englisch:] Ermittlung der internen CPUs
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
GNUPG SSL
SSL Commands
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
BLOG
IT-SUPPORT
