Prewired

Random Thoughts Aligned..

All Articles

Sun 16 November 2014

Computing

By John Troon

Are we taking advantage of the computing power we have?

Computing power is ever increasing not just with high clock cycles but with multiple logical processors referred as cores. Clock cycles determine the number of instructions a processor can process within a given interval of time. The more the number of ...

Fri 03 October 2014

Linux

By John Troon

Testing for ShellShock in Linux (CentOS/OEL)

Below is a simple bash script I've been using to test for shellshock vulns in my Linux setups. Though, it's not a script to really decide weather you are totally safe of not, due to the nature of shellshock and other different attack vectors that ...

Sat 13 September 2014

Linux

By John Troon

Exploring anti-DOS tools for Apache httpd

Slowloris is among the well known "Denial Of Service" (or DOS) tool used by both experienced attackers and script kiddies. This evening, I've been testing mod_evasion and mod_antiloris on Apache httpd /2.2.15 (Oracle Linux 6.5 using Redhat built ...

Sun 07 September 2014

Linux

By John Troon

The "SCTP" protocol

TCP and UDP protocols have been in around for approximately 20+ years now. Even though they have helped in building nice Internet applications since inception, things are changing in the techie world and they will always change. TCP being a connection ...

Tue 19 August 2014

Linux

By John Troon

Setting up SSH With Two-Factor Authentication

Two-factor authentication adds a second level of authentication to an account log-in. When you have to enter only your username and one password, that's considered as a single-factor authentication. 2FA requires the user to have two out of three types ...

Tue 24 June 2014

repost, Linux

By John Troon

Disk benchmark with bonnie in Linux

bonnie++ is a different tool compared to other disk testing tools, which are probably included in other performance monitoring tools like vmstat just to mention the most common one on any Linux install. It runs a performance test of the filesystem I/O ...