nu11secur1ty

RECOMMENDED: FOR ANY KIND OF "COLLEAGUES" ###RedHat Objectives### ---------------------------------------------------------- . Boot, reboot, and shutdown the system normally . Diagnose and correct problems at boot . Boot systems into different runlevels for troubleshooting and system maintenance . Use single-user mode to gain access to a system for which the root password is not known . Diagnose and correct misconfigured networking settings . Diagnose and correct hostname resolution problems . Diagnose and address permissions problems and SELinux policy violations . Diagnose and correct non-hardware disk storage problems . Adding new partitions, logical volumes, filesystems, and swap areas to a system non- destructively . Manually open, mount, unmount, and close LUKS-encrypted filesystems . Extend existing unencrypted ext4-formatted logical volumes . Login or switch user to the root account . Use ssh and VNC to access remo...

Introduction: Public networks like the Internet are dangerous places. Anyone who has a computer attached to the Internet (even transiently) understands these dangers. Attackers can exploit insecurities to gain access to a system, to obtain unauthorized access to information, or to repurpose a computer in order to send spam or participate in attacks on other high-profile systems (using SYN floods, as part of a Distributed Denial of Service attacks). Distributed Denial of Service (DDoS) attacks are orchestrated from many systems across the Internet (so-called zombie computers) to consume resources on the target system and make it unusable for legitimate users (exploiting TCP's three-way handshake). For more information on a protocol that removes this ability by using a four-way handshake with cookies (Stream Control Transmission Protocol [SCTP]), see the Resources section. The origin of SELinux SELinux is a product of government and industry, with design and development provid...