Davoud Teimouri

Virtualization & Datacenter

Category: Linux

[Review]: Packet Drop vs Packet Loss – Linux

Packet Loss

Actually, Packet Loss occurs when one or more packet can’t reach their destination because of some issue such as link congestion, TCP can detect packet loss and send the packet again (During packet recovery process) but packet loss has impact on users, who are using streaming media application and actually all application that using unreliable protocols such as UDP.

Packet Drop is typically discarding packets on different layers after processing packets and packet drop is one of reasons of data loss in some conditions.

[Linux]: /etc/sysconfig/network – No Such File or Directory

Linux Distribution

/etc/sysconfig/network – Missing! Sometimes, you did install Linux on a virtual machine that the virtual machine has no NIC, when installation has been completed, you will face with the below error during “ifdown”, “ifup” or restarting network services:

This is the usual error, because operating system doesn’t detect any NIC during installation and “Networking” […]

kernel: WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xbb/0xe0 – Oracle Enterprise Linux

Most of modern servers hardware are using UEFI instead of legacy BIOS and modern OS has dedicated partition to stores boot and EFI values. Some times, the partition gets full or OS generate the below log: kernel: WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xbb/0xe0 Kernel includes a CONFIG_EFI_VARS_PSTORE feature, and a feature that dumps kernel message log (= […]

New Release – Kali Linux 2017.1

Kali Linux

Kali Linux is one of most popular Linux distributions and many security experts are using this distribution as penetration testing system. Kali Linux is a Debian based distribution and most Kali’s packages are imported from Debian repositories. Kali has more than 300 preinstalled tools for penetration testing such as Armitage (a graphical cyber attack management tool), nmap (a […]

New Release – Red Hat Enterprise Linux 6.9

New release of Red Hat Enterprise Linux has been released by Red Hat at 21st March 2017. Red Hat Enterprise Linux 6.9 comes with lot of new features and updates. New Features Here is new features and major enhancements introduced in Red Hat Enterprise Linux 6.9: General Updates Authentication and Interoperability Clustering Compiler and Tools Directory Server in […]

Remove Multipath Device – Map in use!

Multipath

Multipath Device, Remove From Linux Based on Red Hat solution (https://access.redhat.com/solutions/47438), the below steps should be done before flush any multipath device, otherwise the command will be failed: Locate any subsystem or process holding the multipath device open. For any subsystem or process holding the multipath device open, stop the process, or issue commands to […]

Oracle Software Collections 2.3

The Software Collections library allows you to install and use several different versions of the same software at the same time on a system.  Software collections are primarily intended for development environments.  These environments often require more recent versions of software components such as Perl, PHP, or Python to access to the latest features.  However, […]

Find HBA Firmware Version in Linux – Easy Way

You need to know, what is version of your HBA firmware to upgrade it or install compatible driver version. There is many ways to find firmware version but I want to share easier way. Just logon to your Linux machine with Sudo user and run the below command:

Davoud TeimouriDavoud Teimouri is as a […]

Latest Linux Distributions Release & Update- 4th Week 2017

Linux Distribution

Latest Releases Let’s review latest Linux distributions releases and updates in this week till now. Talis 2.10 The Amnesic Incognito Live System (Tails) distribution is a Debian-based project which focuses on security and anonymity. Tails includes tools for removing meta data from files and routes Internet traffic through the Tor anonymizing network. The project’s latest release, […]

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