Increase your Linux server Internet speed with TCP BBR congestion control

Posted on in Categories Cloud Computing last updated July 22, 2017

I recently read that TCP BBR has significantly increased throughput and reduced latency for connections on Google’s internal backbone networks and google.com and YouTube Web servers throughput by 4 percent on average globally – and by more than 14 percent in some countries. The TCP BBR patch needs to be applied to the Linux kernel. The first public release of BBR was here, in September 2016. The patch is available to any one to download and install. Another option is using Google Cloud Platform (GCP). GCP by default turned on to use a cutting-edge new congestion control algorithm named TCP BBR.

Why port 80 (HTTP) reported as open by nmap when it is closed?

Posted on in Categories Security last updated July 2, 2017

Why are some ports reported as open by nmap?
I recently setup a small server which is running Debian 9. The purpose of this machine is to run OpenVPN server on port 443 to bypass censorship. It runs the following services and nothing else:

  1. Squid on private IP belongs to VPN pool (10.8.0.1:3128)
  2. SSH on private IP belongs to VPN pool (10.8.0.1:22)
  3. DNS resolver on private IP belongs to VPN pool (10.8.0.1:53)
  4. OpneVPN on public IP port 443 (server_public_ip_address:443)

Download of The Day: Debian Linux 9 ( Stretch )

Posted on in Categories Linux News last updated June 18, 2017

Debian GNU/Linux version 9.0 stretch has been released ( jump to download ) after many months of constant development and available for download in various media format. Debian 9.0 is a free operating system includes various new features such as support for mips64el architecture, GNOME 3.22, KDE Plasma 5.8, LXDE, LXQt 0.11, MATE 1.16, Xfce 4.12, Linux kernel 4.9 and more. Debian 9 is dedicated to the project’s founder Ian Murdock, who passed away on 28 December 2015.
Debian 8.x 64-bit-mate-desktop-screenshot

neofetch: Awesome system info bash script that supports Linux, MacOS, and Unix-like systems

Posted on in Categories Command Line Hacks, Howto last updated May 7, 2017

The neofetch command written in a bash shell. The main purpose of neofetch is to be used in screenshots to display other users what operating system or Linux distro you are using including theme, icons and more. This command shows info about your system next to an image, your operating system logo and other info. Neofetch version 3.1.0 has been released. Let us see how to install the latest version and use it.
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