Linux TCP/IP, GreenIT and more…
I want to test some tools to restore deleted data on EXT3 file system, to make this tests safe on a production server without loosing date I created a virtual HDD with 100MB size that running as a file.
Create a 100MB virtual HDD: Continue reading ‘Ext3 restore data’
Stupid situation if device X tries to communicate with Bob, but Bob send no answer to request. Bob has a problem, his ARP table is broken and he cant reach X.
Solve this problem by clearing the ARP information table: Continue reading ‘Clear ARP-Cache’
My tiny mail-command collection of the very important administrator mail command.
You can test E-Mail-Server create scripts with this useful command or send yourself some notifications.
The simplest one: Continue reading ‘Mail command’
Penetration testing(pentest) is very important for development and production environments unfortunately many people forget that and play with fire.
Pentest is a method of evaluating the security of a server services and hardware devices.
This hard analysis is carried out from the position of a potential attacker, in this case this attacker is a white hat and he can involve active exploitation of security vulnerabilities. Continue reading ‘Penetration Testing’
Master Boot Record (MBR), a small program that is executed when a computer boots up.
You can save your MBR with a simple DD-command to a file:
1 | dd if=/dev/sda count=1 bs=512 > /var/backup/MBR |
From this file you can restore your MBR very easy:
1 | dd if=/var/backup/MBR of=/dev/sdb |