Early access to new WebUi - GNS3 2.2.0 alpha 4 upgrade on Linux

GNS3 version 2.2.0 alpha 4 has been released, it gives you early access to the new web-ui with the upgrade of v2.2!

Major new features are the WebUi (read only for now), a new GNS3 VM based on Ubuntu 18.04 LTS, Hyper-V support for the GNS3 VM, new symbols (affinity theme), new template creation system, link status detection for Qemu VMs, custom adapters configuration, console support for clouds, new project import/export and much more! 

Please see What’s new in GNS3 version 2.2 for a detailed overview.

IMPORTANT NOTE to upgrade from 2.1.x and earlier versions of GNS3

Please do not upgrade if you are working on something important like a certification or something else. Understand there is no rollback possible once you open an older project in version 2.2

Backup all your projects, settings and snapshot the GNS3 VM. Version 2.2 is in alpha stage which means many things could be broken or not work as expected. Only advanced users who are comfortable with GNS3 should try this alpha release.

Linux installation

Ubuntu/Debian, install from our PPA:

sudo add-apt-repository ppa:gns3/unstable

sudo apt-get update

sudo apt-get install gns3-gui

For upgrading from the stable repository:

sudo add-apt-repository --remove ppa:gns3/ppa

sudo add-apt-repository ppa:gns3/unstable

sudo apt-get update

sudo apt-get upgrade

For upgrading from the unstable repository:

sudo apt-get update

sudo apt-get upgrade

For other Linux distributions, we recommend an installation via Pypi:

pip3 install gns3-gui==2.2.0a4

pip3 install gns3-server==2.2.0a4

This is the news I've been waiting for! For many of us this should make it easier to sneak in some lab time by just spooling up your server and then log into GNS3 via browser to lab! 

A final release is expected during the first half of 2019 and I am so excited! 

Source & Credits : Jeremy Grossmann@GNS3

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wttr.in - Eye Candy Weather Forecast in Linux Command Line & Browser

I recently came across an eye candy console-oriented weather forecast service tool wttr.in — the right way to check the weather!

wttr.in is a console-oriented weather forecast service that supports various information representation methods like terminal-oriented ANSI-sequences for console HTTP clients (curl, httpie, or wget), HTML for web browsers, or PNG for graphical viewers.

wttr.in uses wego for visualization and various data sources for weather forecast information. It uses the USCS units for the queries from the USA and the metric system for the rest of the world by default.

You can see it running here: wttr.in.

Usage

You can access the service from a shell or from a Web browser like this:

$ curl wttr.in
Weather for City: Paris, France

     \   /     Clear
      .-.      10 – 11 °C     
   ― (   ) ―   ↑ 11 km/h      
      `-’      10 km          
     /   \     0.0 mm         

You can get the weather information for a specific location by adding the desired location to the URL in your request like this:

$ curl wttr.in/London
$ curl wttr.in/Moscow

If you omit the location name, you will get the report for your current location based on your IP address.

Use 3-letter airport codes in order to get the weather information at a certain airport:

$ curl wttr.in/muc      # Weather for IATA: muc, Munich International Airport, Germany
$ curl wttr.in/bhv      # Weather for IATA: bhv, Bahawalpur Airport, Pakistan

You can also use IP-addresses (direct) or domain names (prefixed with @) to specify a location:

$ curl wttr.in/@github.com
$ curl wttr.in/@msu.ru

To get detailed information online, you can access the /:help page:

$ curl wttr.in/:help

Source:
Igor Chubin

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Failure to download extra data files after installing "ttf-mscorefonts-installer" on Ubuntu 18.04 LTS

This package "ttf-mscorefonts-installer" is used to download Microsoft's font files (those files are made freely available by Microsoft) from the Internet and install them. Since, you must accept the EULA of Microsoft to use those font files, those fonts cannot be included in the package like other Free (Free as freedom) packages. Annoying messages of "failure to download extra data files from ttf-mscorefonts-installer in update notifier keep popping up after reboot. I have tried a lot of available solutions on Ubuntu forums and the following worked for me.

First of all, try to reinstall the package, and download the data files needed to configure the package.
sudo dpkg-reconfigure ttf-mscorefonts-installer

If it doesn't work, than opt for manual installation of ttf-mscorefonts-installer as below:

Go to Debian's Site and download the latest ttf-mscorefonts-installer_3.7

wget http://ftp.de.debian.org/debian/pool/contrib/m/msttcorefonts/ttf-mscorefonts-installer_3.7_all.deb
sudo apt purge ttf-mscorefonts-installer -y
sudo dpkg -i ttf-mscorefonts-installer_3.7_all.deb

Now, you won't see the annoying notifications from update notifier.

HTH.

Credits:
Muaad ElSharif

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Cisco Packet Tracer 7.2.1 Installation on Ubuntu 18.04 LTS Linux

Cisco Packet Tracer v7.2.1 was released in mid 2018, which doesn’t appear to need libicui18n.so.52 unlike CPT v7.1 (The bug was fixed in the latest release and v7.2.1 runs without any issue on Ubuntu 16.04). However, CPT v7.2.1 on Ubuntu 18.04 is unable to locate libpng12. Following solution (QT Libraries, libcu52 and libpng12 installation) fixed it for me:

Install Qt libraries:

sudo apt install libqt5webkit5 libqt5multimediawidgets5 libqt5svg5 libqt5script5 libqt5scripttools5 libqt5sql5

Install libcu52:

wget http://mirrors.kernel.org/ubuntu/pool/main/i/icu/libicu52_52.1-3ubuntu0.8_amd64.deb
sudo dpkg -i libicu52_52.1-3ubuntu0.8_amd64.deb

Install libpng12:

wget http://ftp.debian.org/debian/pool/main/libp/libpng/libpng12-0_1.2.50-2+deb8u3_amd64.deb
sudo dpkg -i libpng12-0_1.2.50-2+deb8u3_amd64.deb

Now, CPT should start correctly via 'packettracer' command in terminal.

Credits: 
Stack Exchange

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The VMware Installer could not shut down all running virtual machines - VMWare Workstation upgrade error

Yesterday, while upgrading VMware Workstation 14.1.2-8497320 to 14.1.3-9474260 on my Ubuntu 16.04.5 LTS machine, got the following error message:

"The VMware Installer could not shut down all running virtual machines. If you have Encrypted VMs open, please shut them down or suspend them now and press 'Retry' to continue."

No VM instance was running/open in my case, tried pressing Retry button on installation GUI, but still got the same error message. Rebooted the physical machine tried upgrading (both in-app and manual upgrade) and got the same error message again. Tried multiple tweaks and finally after much struggle managed to resolve the issue by following steps:

• Remove all vmware startup scripts
  rana@ranatics:~# sudo rm /etc/init.d/vmware
  rana@ranatics:~# sudo rm /etc/init.d/vmware-USBArbitrator
  rana@ranatics:~# sudo rm /etc/init.d/vmware-workstation-server
  
• Reboot your computer
  rana@ranatics:~# sudo reboot
  
• Uninstall your old vmware installation
  rana@ranatics:~# sudo /usr/bin/vmware-installer -u vmware-workstation
  
• Download and install the updated version
  rana@ranatics:~# sudo VMware-Workstation-Full-14.1.3-9474260.x86_64.bundle

Enjoy!

HTH,
Rana.

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SecureCRT "Error while loading shared libraries: libpng16.so.16" on Ubuntu 16.04

Today, I installed SecureCRT Version "8.3.3 (build 1646) - Official Release - May 3, 2018" on Ubuntu 16.04.4 LTS machine. After installation, SecureCRT won't launch and gave the following error in terminal.

$ SecureCRT
SecureCRT: error while loading shared libraries: libpng16.so.16: cannot open shared object file: No such file or directory

Tried various tweaks, and the following did the job.
Firstly, install required PNG Library "libpng16-16" package with the following command:

$ sudo apt install libpng16-16

Run the program, and if you come across `GLIBCXX_3.4.22' not found error than go further below to next step:

$ SecureCRT
SecureCRT: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.22' not found (required by SecureCRT)

Now, Update GLIBCXX_3.4.22 library packages from this untrusted PPA by adding ppa:ubuntu-toolchain-r/test to your system's Software Sources.

$ sudo add-apt-repository ppa:ubuntu-toolchain-r/test
$ sudo apt update
$ sudo apt dist-upgrade -y

You can check if you have GLIBCXX_3.4.22 like this:

$ strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | grep GLIBCXX_3.4.22

GLIBCXX_3.4.22  

Now, run SecureCRT and enjoy!

HTH,
Rana Tauqeer.

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Unable to login via HTML5 console on EVE-NG

Issue:
Unable to login via HTML5 console on EVE-NG's Web GUI after upgrade to EVE-NG 2.0.3-86 or when in HTML5 console, disconnect button gets you into a guacamole login page and can’t get any sessions in HTML5.

Solution:
This is a typical corrupt Guacamole SQL database issue; whether happened randomly or even during/after eve upgrade process, there are two very simple proposed solutions for this problem:

1. Logout/Login from/into eve to be able to open html console again.
   or
2. Issue the following command on eve-ng vm:
   #cat /opt/unetlab/schema/guacamole-update.sql | mysql -u root --password=eve-ng guacdb
   and than login/logout from/into eve.

HTH,
Rana Tauqeer.

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Setting SecureCRT as default telnet handler for EVE-NG devices on Firefox.

While doing Lab practice on EVE-NG's Web GUI on Firefox Web-browser, telnet (by double click or right-click console option) to a network device opens Ubuntu's default terminal (Gnome Terminal) via 'xdg-open' script from 'xdg-utils' by default. Console to multiple devices opens a new instance of Gnome Terminal for each telnet session, which for me is not handy and makes it too messy! 

I'm rather a SecureCRT fan, and have always preferred it over other available terminal emulators due to it's awesome features and handy tools. So, I was trying to find a way to open the EVE-NG's telnet:// or ssh:// links directly via SecureCRT. Manual telnet/SSH from SecureCRT to EVE-NG's devices works fine by default, but, this becomes hectic for full scale CCIE Labs having over 50 or more devices running.

With the help of VanDyke Technical Support, I was able to figure out a way to get Firefox on Ubuntu to prompt you for which application to open SSH/Telnet links with.

Following instructions can make it possible:

• Open Firefox and type “about:config” in address bar.
• Create a new Boolean preference (right click on an empty space), name it
  “network.protocol-handler.expose.telnet” (without inverted commas) for telnet handler, and set the value “false”.
• Create another new Boolean preference (right click on an empty space), name it
  “network.protocol-handler.expose.ssh” (without inverted commas) for ssh handler, and set the value “false”
• Restart the browser.

This should be enough for Firefox to let us select an external application to open “telnet://” links. 
While testing I would suggest leaving the "Remember my choice for ..." option unchecked. When prompted you should be able to select SecureCRT, by default it is located at /usr/bin/SecureCRT.

PS:
I'm using latest SecureCRT 8.3.2 on Ubuntu 16.04.4 LTS (Xenial) and while attempting various suggested workarounds, messed up SecureCRT's Tab feature (it kept opening new sessions in new instances rather than in tabs).

There is a work around that you could try. It would force SecureCRT into Single Instance mode, though you would not be able to open two separate instances of SecureCRT.

To accomplish this:

• Locate the config folder info in the General / Configuration Paths category of SecureCRT's Global Options
• Close all instances of SecureCRT/FX
• Navigate to your SecureCRT configuration folder
• Locate and open the Global.ini file
• Find the line containing "Single Instance"
• Modify the line to D:"Single Instance"=00000001
• Save the changes to Global.ini

Now that SecureCRT is in Single Instance mode any link selected should open in a new tab.

HTH,
Rana Tauqeer.

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SerureCRT 8.3 installation on Ubuntu 16.04LTS Linux

This tutorial uses SerureCRT 8.3 - Nov 9, 2017 release running on Ubuntu 16.04LTS machine, follow the steps below and enjoy fully featured rock-solid terminal emulation:

• Download the latest SecureCRT for Linux Ubuntu 16.x 64-bit (scrt-8.3.0-1514.ubuntu16-64.x86_64.deb) from official Website 
• Double click the downloaded .deb file, and install it through Ubuntu Software Center for ease.
• Open a terminal (Ctrl+Alt+t) and download the perl script:
  rana@Ubuntu16:~$ wget http://download.boll.me/securecrt_linux_crack.pl
• Check out the SecureCRT installation path:
  rana@Ubuntu16:~$ whereis SecureCRT
  SecureCRT: /usr/bin/SecureCRT 
• Run the perl script on SecureCRT's installation path '/usr/bin/SecureCRT':
  rana@Ubuntu16:~$ sudo perl securecrt_linux_crack.pl /usr/bin/SecureCRT
  If the script is successful, the registration information output will be generated in terminal.
• Now, run 'SecureCRT' command in terminal and follow the prompts to fill out the registration information output in 'Enter License Manually' Tab.
• All Done!

(Script share is just for the sake of testing/educational purposes and do not endorse cracking, use in production or intend to violate any copyrights. Please, properly give credits to the developers; download trial and buy the most awesome SecureCRT - Peace!)

HTH,
Rana Tauqeer.

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GNS3 2.0.3 Error on Ubuntu 16.04LTS: IOS/IOU_name.bin%20is%20not%20executable

GNS3 2.0.3 Error Message on Ubuntu 16.04LTS:

home/rana/GNS3/images/IOU/i86bi-linux-l2-adventerprisek9-15.6.0.9S.bin%20is%20not%20executable

Some fellows came across the above error, while adding/configuring IOS/IOU on GNS3 2.0.3 and the development version GNS3 2.1.0 running on Ubuntu 16.04LTS machines. The error message is self explanatory, and just needs you to add execution rights to the IOS/IOU files in GNS3's images directory, like below and can be repeated for all IOS/IOU giving the same error:

(The below example assumes GNS3's default directories, and shows rights inclusion to L2 IOU, L3 IOU and a c7200 router IOS, just open a terminal with Ctrl+Alt+t, and do the following from '/home/user' directory)

rana@Ubuntu16:~cd GNS3/images/IOU
rana@Ubuntu16:~/GNS3/images/IOU$ sudo chmod +x i86bi-linux-l2-adventerprisek9-15.6.0.9S.bin
[sudo] password for rana: 

rana@Ubuntu16:~/GNS3/images/IOU$ sudo chmod +x i86bi-linux-l3-adventerprisek9-15.4.1T.bin

rana@Ubuntu16:~/GNS3/images/IOU$ cd ..
rana@Ubuntu16:~cd GNS3/images$ cd IOS
rana@Ubuntu16:~/GNS3/images/IOS$ sudo chmod +x c7200-adventerprisek9-mz.153-3.XB12.bin
rana@Ubuntu16:~/GNS3/images/IOS$ 

Now, open GNS3 again and add the IOS/IOU again in Preferences Tab, everything should work as intended.


HTH,
Rana Tauqeer.

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GNS3 2.0.3 & GNS3 2.1.0 Error on Ubuntu 16.04LTS: uBridge is not available, path doesn't exist.

GNS3 2.0.3 ERROR:
"uBridge is not available, path doesn't exist, or you just installed GNS3 and need to restart your user session to refresh user permissions"

Solution:

I came across the above uBridge error, while running GNS3 2.0.3 stable version (also tried the development version of GNS3 2.1.0, but stuck at the same error), on my Ubuntu 16.04LTS Machine. Applied almost all available solutions on GNS3 forums and other blogs but nothing worked. Finally, I was able to figure out the following solution, which did the charm! 

Step-1: Open a terminal (Ctrl+Alt+t), and login as root/Superuser 
rana@Ubuntu16:~$ su - 
Password: 
root@Ubuntu16:~$

Step-2: Update repository 
root@Ubuntu16:~$apt-get update 

Step-3: Install 'sudo' 
While trying and working around other available solutions, I suspect that something went wrong with 'sudo' too, this step can be exempted/skipped if 'sudo' is working correctly for you - (which can be checked with 'sudo ls' command) 
root@Ubuntu16:~$apt install sudo 

Step-4: Add the user ('rana' in my case) to group sudo 
root@Ubuntu16:~$usermod -aG sudo rana 

Step-5: Reboot the machine
root@Ubuntu16:~$reboot

Step6: After reboot, reconfigure ubridge 
rana@Ubuntu16:~$sudo dpkg-reconfigure ubridge 

Step-7: Run GNS3, test it and enjoy learning!!! 

[The same answer and other suggested workarounds related to this particular error can also be found at GNS3 Community Forums]

HTH, 
Rana Tauqeer.

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Cisco Packet Tracer 7.1 Installation on Ubuntu 16.04 LTS Linux

Cisco Packet Tracer (CPT) is a free Network and IoT Simulation & Visualization tool for starters in Cisco Networking Technologies. Packet Tracer's 32bit & 64bit versions are available for Microsoft Windows 7, 8.1 and 10, and a 64-bit version is available for Linux (Not available for macOS at this time). This tutorial will focus on installing Cisco Packet Tracer 7.1 on Ubuntu 16.04.3 LTS (Same process is valid for all Debian Linux based Distros):

• Download Packet Tracer 7.1 from Cisco Networking Academy (NetAcad)
  (you must be a member of NetAcad to download CPT)
• Open a terminal (by pressing Ctrl + Alt + t), and change directory to the downloaded file location (/home/User/Downloads' in this case) and extract the downloaded .tar file :
  $ cd ~/Downloads
  $ tar -xzvf Cisco_PacketTracer71_64bit_linux.tar.gz

• Start the installation by typing '/.install' in extracted files directory:
  $ cd Cisco_PacketTracer71_64bit_linux
  $ sudo ./install
• You will be asked to read the terms (EULA):
  (Keep pressing 'Enter' key until EULA is read 100%)
• Now you'll be asked to accept EULA:
  Do you accept the terms of the EULA? (Y)es/(N)o(Press 'Y' to accept EULA)
• Enter location to install Cisco Packet Tracer or press enter for installation in default directory [/opt/pt]:
  (Press ‘Enter’ key to select the default location /opt/pt )
• Now, you'll be asked, Should we create a symbolic link "packettracer" in /usr/local/bin for easy Cisco Packet Tracer startup? [Yn] (Press 'Y' to create a symbolic link)
• After completion of installation, launch Packet Tracer 7.1 by typing ‘packettracer’ in terminal.
  $packettracer
  Starting Packet Tracer 7.1
• Enter your Cisco NetAcad Credentials to login or login as guest.
  
  
  

PS:

Some folks have reported that their Packet Tracer installation completed successfully, but 'packettracer' command didn't open CPT, and no error message was shown, like below: 
rana@Ubuntu16:~$ packettracer
Starting Packet Tracer 7.1
rana@Ubuntu16:~$ 
In this case, follow the below solution:

• Open a terminal, and download Debian package containing the older version of 'libicui18n' (CPT requires libicui18n with an older version '52' instead of '55', which is not available in Ubuntu16.04 LTS.)
• $wget http://security.ubuntu.com/ubuntu/pool/main/i/icu/libicu52_52.1-3ubuntu0.7_amd64.deb
• Install the .deb package
  $sudo dpkg -i libicu52_52.1-3ubuntu0.7_amd64.deb
• Now CPT should start correctly via 'packettracer' in a terminal.
  [Credits: Steve]

HTH,
Rana Tauqeer.

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Fascinating Box Up Time!

A fellow sent me a picture showing UP TIME of a Production Switch, the longest I have ever seen!!!!

 Box UpTime of 19years; just inplace upgrades, never reloaded or lost power, isn't it fascinating? How much more have you seen?

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Clock Rate or Clocking

Clock rate/Clocking is actual line speed and is configured on serial links in DCE side of network. When you set the clock rate for a serial interface, you are setting the speed of the interface, in other words, actual rate of data transfer. It has to do with the physical speed of the circuit (typically based on TDM architectures) where your clock cycle is 'x' times per second (deriving bandwidth of 'x' bits per second).  You can't send at speeds greater than your clock rate as this is a physical limiting!

The clock rate is used to match the clocks on the receiver and transmitter on remote and local router. The two routers need to sync up their clock perimeters in order to decode the packets coming on their interfaces.

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Ethernet Frame - Explained!

Ethernet Frame

The Ethernet frame structure is defined in the IEEE 802.3 standard. Following explains a typical Ethernet Frame and description of each field in the frame:

• Preamble – informs the receiving system that a frame is starting and enables synchronization. The Preamble consists of seven bytes all of the form 10101010, and is used by the receiver to allow it to establish bit synchronization (there is no clocking information on the Ether when nothing is being sent). This is a stream of bits used to allow the transmitter and receiver to synchronize their communication. The preamble is an alternating pattern of binary 56 ones and zeroes. The preamble is immediately followed by the Start Frame Delimiter. An alternating 1,0 pattern provides a 5 MHz clock at the start of each packet, which allows the receiving devices to lock the incoming bit stream.

• SFD (Start Frame Delimiter) – signifies that the Destination MAC Address field begins with the next byte. The Start frame delimiter is a single byte, 10101011, which is a frame flag, indicating the start of a frame. This is always 10101011 and is used to indicate the beginning of the frame information. The preamble is seven octets and the SFD is one octet (synch). The SFD is 10101011, where the last pair of 1s allows the receiver to come into the alternating 1,0 pattern somewhere in the middle and still sync up to detect the beginning of the data.

• Destination MAC – identifies the receiving system. This is the MAC address of the machine receiving data. This transmits a 48-bit value using the least significant bit (LSB) first. The DA is used by receiving stations to determine whether an incoming packet is addressed to a particular node. The destination address can be an individual address or a broadcast or multicast MAC address. Remember that a broadcast is all 1s—all Fs in hex—and is sent to all devices. A multicast is sent only to a similar subset of nodes on a network.

• Source MAC – identifies the sending system. This is the MAC address of the machine transmitting data. The SA (Source Address) is a 48-bit MAC address used to identify the transmitting device, and it uses the least significant bit first. Broadcast and multicast address formats are illegal within the SA field.

• Type – defines the type of routed protocol inside the frame, for example IPv4 or IPv6. 802.3 uses a Length field, but the Ethernet_II frame uses a Type field to identify the Network layer protocol. The old, original 802.3 cannot identify the upper-layer protocol and must be used with a proprietary LAN—IPX, for example. The Type field for IPv4 is 08-00, mostly just referred to as 0x800 in hexadecimal, and 0x86dd for IPv6.

• Data and Pad – (aka Payload) contains the payload data. Padding data is added to meet the minimum length requirement for this field (46 bytes). This is the length of the entire Ethernet frame in bytes. It is rarely larger than 1500bytes as that is usually the maximum transmission frame size (MTU) for most serial connections. Ethernet networks tend to use serial devices to access the Internet. The data is inserted here. This is a packet sent down to the Data Link layer from the Network layer. The size can vary from 46 to 1,500 bytes.

• FCS (Frame Check Sequence) – contains a 32-bit Cyclic Redundancy Check (CRC) which allows detection of corrupted data. This field contains the Frame Check Sequence (FCS) which is calculated using a Cyclic Redundancy Check(CRC). The FCS allows Ethernet to detect errors in the Ethernet frame and reject the frame if it appears damaged.FCS is a field at the end of the frame that’s used to store the cyclic redundancy check (CRC) answer. The CRC is a mathematical algorithm that’s run when each frame is built based on the data in the frame. When a receiving host receives the frame and runs the CRC, the answer should be the same. If not, the frame is discarded, assuming errors have occurred.

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What is Ethernet?

Ethernet is a family of physical and data-link layer technologies for Local Area Networks (LANs) that is used to transport streams of data. It is a contention-based media access method that allows all hosts on a network to share the same link’s bandwidth. Ethernet uses both Data Link and Physical layer specifications.

Ethernet uses a protocol called Carrier Sense Multiple Access with Collision Detection (CSMA/CD), which helps devices share the bandwidth evenly while preventing two devices from transmitting simultaneously on the same network medium.

The type of network cabling and signaling specifications described in Ethernet were first developed by Xerox in the late 1970, which were later revised in IEEE 802.3

IEEE 802.3 is a standard specification for Ethernet, a method of physical communication in a local area network (LAN). In general, 802.3 specifies the physical media and the working characteristics of Ethernet, what is commonly known as the CSMA/CD protocol.

Four data rates are currently defined for operation over optical fiber and twisted-pair cables in IEEE 802.3:

10 Mbps         10Base-T Ethernet
100 Mbps        Fast Ethernet
1,000 Mbps      Gigabit Ethernet
10,000 Mbps     10 Gigabit Ethernet

Following are the main characteristics of Ethernet:

• Easy to understand, implement, manage, and maintain

• Allows low-cost network implementations

• Provides extensive topological flexibility for network installation

• Guarantees successful interconnection and operation of standards-compliant products, regardless of manufacturer

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How To Run Juniper Router JunOS Olive VM image(.OVA) in GNS3

How To Run Juniper Router JunOS Olive VM image (.OVA) in GNS3

First of all, download, install and run Oracle VM VirtualBox, and GNS3 on your PC.

Secondly, download the JunOS Olive VM image from the link below:

Download JunOS image file for GNS3

(Link searched from internet and pasted here for reference only)

After downloading the JunOS VM image, open the Oracle VM VirtualBox console. Click File and select Import Appliance to import VM (or just double click on the downloaded file and run it with Oracle VM VirtualBox to Import Appliance.)

Now, click the Browse button to locate the downloaded JunOS image file, select it, and then click Next

Accept the default resource values or adjust them as per requirement, and then click Import.(I'm using default values that came with downloaded VM.

Once the VM is imported, select it, and click Start to power on.

Note:
In case, while importing the Virtual Machine in Oracle VM VirtualBox, you get the error "could not start the machine because following physical network interfaces were not found" than click Change Network Settings, select Microsoft KM-TEST Loopback Adapter from the list, and then click OK.
(If Microsoft Lopback Adapter is not already installed, than install it via the "Add Hardware Wizard" on windows and than select it in network settings)

If this error does not occur than, skip this step.

Now, on GNS3, click Edit, and select Preferences. On the Preferences window, select VirtualBox VMs in the left pane, and then select New.Select JunOS Olive VM (Juniper router IOS image)and click Finish.

Now click Edit, change Symbol & Category to Router. Move on to the Network tab, and set the number of adapters as per your requirement (I selected 4 here)

Also, Select the Allow GNS3 to use any configured VirtualBox adapter check box and click OK. Now again press Apply & OK.

Now, in GNS3 console GUI, drag & drop the Junos router and start it.

Switch to the JunOS VirtualBox console or go to console from GNS3. At the login prompt, type root as username and press Enter. The Password is blank
At the next prompt, type cli and press Enter, and "Show Version" to verify the Junos version.

Enjoy.

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