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IPSec Communication for VPN Setup in CentOS 6 / RHEL 6.3


The use of IPSEC transport mode for server to server communication is one of the best solutions to provide authentication, integrity, access control, and confidentiality. IPSEC is built into to the Linux kernel, in other words there is no daemon running in the background. IPSEC does not require port-forwarding; some people elect to use SSH,…

Chroot SFTP Users for Web Hosting Server.


A chroot on Unix operating systems is an operation that changes the apparent root directory for the current running process and its children. A program that is run in such a modified environment cannot name (and therefore normally not access) files outside the designated directory tree. The term “chroot” may refer to the chroot(2) system…

Fork bomb

Can Linux crashes in just one command?


After a very nice discussion over Linux vs Windows between the group members, all the Linux & Windows supporter was trying to prove their OS better. One of the Windows supporter write a text string (can say a command) to execute in a Linux terminal, which can crash it in just one enter. WARNING!!!: DON’T…

Configure syslog to print the Security violation alarm on user terminal (via Linux Explore)


Open the /etc/rsyslog.conf file for syslog configuration in fedora Linux (some linux like CentOS has /etc/syslog.conf). It will show the something similar as given below: # Log all kernel messages to the console. # Logging much else clutters up the screen. #kern.*                                                 /dev/console # Log anything (except mail) of level info or higher. # Don’t…

Configure syslog to print the Security violation alarm on user terminal


Open the /etc/rsyslog.conf file for syslog configuration in fedora Linux (some linux like CentOS has /etc/syslog.conf). It will show the something similar as given below: # Log all kernel messages to the console. # Logging much else clutters up the screen. #kern.*                                                 /dev/console # Log anything (except mail) of level info or higher. # Don’t…