Cannot extend drive c in Windows?

There are many reasons that lead you not to be able to extend your drive c. You can find those reasons here.

But now I would  like to share without you how you can extend using a free third-party tool in the case that your partition is “basic” type.

Follow below steps:

  • Download MiniTool Partition Wizard Free Edition and install it.
  • Now you can just open the tool
  • Click on partition that you want to extend (in our case, drive c)
  • Right click and choose “Extend”
  • Select “Take free space from: [Drive D or your unallocated space]”, then click OK
  • Now, click ‘Apply’ and wait for several minutes to complete the operation and You’re DONE!!!

Sample screenshot:




Preparation for Cisco Global Cyber Ops Scholarship step 2

Getting email titled: Step 2 of 2: Applying to the Cisco Global Cyber Ops Scholarship – The Prequalification Exam

Now it’s time to take this exam, but the thing is what’s to prepare? what topic’s gonna cover? When I ask someone who experienced it, they just answer ‘it’s so basic’. How basic it is???

Now, I would like to share my experience about the topics this exam covered. Yes, it’s basic, but we need to know what kind of things to prepare for it. I cannot tell you guys specific questions because I don’t remember those :)

As the program stated, you need some prerequisites like need to have some knowledge of CCNA1 & CCNA2 or CCENT or CCNA or other related knowledge.

So let get into What topics:

  • Some basic knowledge of how to use computer and internet, it’s like a fun, but it’s true
  • Some basic knowledge of using Windows OS regarding to some basic cmd command lines like cmd, gpedit, dir, ipconfig, arp…
  • Some basic knowledge of Linux file system and commands like /bin, /home, ifconfig, top, ls, grep…
  • Some basic knowledge of the Internet and protocols like TCP, UDP [layer 4], DNS, DHCP, HTTP, HTTPS, SSH [layer 7] or ARP [layer] Here I want to stress as well about a-must knowledge of OSI model
  • Some basic knowledge of security and attacks like VPN, SSL, Antivirus, Firewall, Brute force, DoS, malware…
  • Some basic knowledge of Computer networking, a plus if related to Cisco devices, like routing table, VLAN, STP, NAT…
  • Some basic knowledge of IPv4 and IPv4 addressing like class, netmask, default gateway, private, public, subnetting…

As a conclusion, you must have a fundamental knowledge of computer networking in general, system management on Windows and Linux and security knowledge as it is a so-called “Cisco Global Cyber Ops Scholarship

[Solved] Critical Error: A fatal error has occured during virtual machine execution!…

Running Kali or some Linux box on VirtualBox on Windows, you might face this kind o problem occurs as in the attached image below.

The error message says: “A fatal error has occurred during virtual machine execution! The virtual machine will be powered off. Please copy the following error message using the clipboard to help diagnose the problem:…


Don’t be surprise, the error message most of the time tells you where the root of problem is… like in this case, you just need to expand the detail (some of us might ignore reading further the detail) VirtualBox itself tell  you where to solve the problem.

The detail says: “The guest is trying to switch to the PAE mode which is currently disabled by default in VirtualBox. PAE support can be enabled using the VM settings (System/Processor).”

*** This happen normally when you use the existing virtual disk (.vdi) that did enable it.


So to solve this problem, what you need to do is just following the message: Go to your Vm –> (right click) Settings –> System –> Processor –> (tick) Enable PAE/NX –> OK


That’s it, it now should start properly


Change priority of preferred networks

It is bothering sometimes when you’re connecting to the network you wish to, but suddenly your machine (macbook, laptop…) automatically switches to other network with stronger signal (for example).

To fix to the network (specifically for WiFi connection), you can manage the priority (or order) by the followings:

  1. For MacBook user: System Preferences –> Network –> Advanced… –> Under Preferred Networks, drag networks into the order you prefer –> click OK to finish
  2. For Windows user: Control Panel –> Network and Sharing Center –> Manage Wireless Networks –> now you can move up or down to find the priority you want

Now, that’s it :) the network you intent to connect to will not be switched to other even it has a little lower signal…

How to export pcap to csv using ‘tshark’

The example below show how we can use ‘tshark’ command line tool to read file ‘dorm-9pm-own.pcap’ displaying Wireshark default fields [No., Time, Source, Destination, Protocol, Length and Info] then redirect to file named ‘testFile’

$ tshark -r dorm-9pm-own.pcap -T fields -E separator=, -E quote=d -e _ws.col.No. -e _ws.col.Time -e _ws.col.Source -e _ws.col.Destination -e _ws.col.Protocol -e _ws.col.Length -e _ws.col.Info > testFile.csv

Screen Shot 2018-03-23 at 10.39.47 PM