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This post will help you to understand why we receive the below error and how to solve it. Even if you get different numbers, this solution will work. => Error while creating project: Client version 1.3.13 differs with server version 1.3.3 The IOU VM version number must match with the version number of the GNS3 software. If your IOU VM is running a different version of gns3 than your client, you will get that error message and will have to fix it. You have 2 solutions, One is to degrade your GNS3 to your IOU version. Other one is to upgrade your IOU version to match the GNS3 version. Solution 1:  Identify the version of your IOU. For example, if it is 1.3.3, you will have to download the same (1.3.3) version of GNS3 as well. If you want to download a specific version of GNS3, please visit  https://github.com/GNS3/gns3-gui/releases . Solution 2: If you prefer to use a newer version of GNS3, you can upgrade your old IOU VM to the newer version. This is normal that whenever y...

DHCP Starvation is an attack that works by broadcasting vast numbers of DHCP requests with spoofed MAC addresses simultaneously. I had showed my topology in the above snap, As you can see I have a router that acts as the DHCP server and a Kali linux 2.0 machine which is connected to the same network. The same steps can be followed to hack a Windows or a Linux DHCP server also. This is how my router's DHCP binding looks before the attempt, Router (Before Attack) R1#sh ip dhcp binding Bindings from all pools not associated with VRF: IP address Client-ID/ Lease expiration Type Hardware address/ User name R1# I used yersinia tool to perform the attack, this yersinia comes in built to your Kali operating system. Open terminal, type ' yersinia -G ' and press enter. Click on 'Launch Attack'. Select the tab 'DHCP' and check the second box 'sending DISCOVER packet' and press OK. Within secon...

Last month I had posted how to install kali  on Vmware workstation, this will be the third post in my Kali linux tutorial series. Here in this post, I will be discussing the recommended post installation tips. Below are the few tips which will be covered in this post, Installing Vmware tools on Kali 2.0 To install Vmware tools, open terminal and paste below commands one by one, make sure that you have internet connection. apt-get update apt-get install -y linux-headers-$(uname -r) apt-get install open-vm-toolbox Once you have executed the above commands, reboot your kali machine. Resolving apt-get repository issues If for some reason you chose “no” when asked “use a network mirror” during your Kali installation, you may be missing some entries in your /etc/apt/sources.list file. If that's the case, Add below 4 lines to your sources.list file, deb http://http.kali.org/kali sana main non-free contrib deb http://security.kali.org/kali-security sana/updates main contrib non-free deb-sr...

The Hot Swappable Router Protocol (HSRP) is a way to build redundancy into your network by allowing two or more routers to continuously test each other for connectivity, and take over if a router fails.As multiple routers can participate in the HSRP group, there has to be an election to determine who's the primary router. This HSRP election is based on a priority value (0 to 255) that is configured on each router in the group. By default, the priority is 100. The router with the highest priority value (255 is highest) becomes the active router for the group. If all router priorities are equal or set to the default value, the router with the highest IP address on the HSRP interface becomes the active router. In this post, we are going to make our Kali machine a HSRP participant and to become the active router by setting the highest priority to it. Yersinia tool (in built in Kali) helps us to perform this test with ease. For more information on HSRP, please refer  RFC 2281 Yersinia Y...

Cisco ASA stands for Adaptive Security Appliance.In brief, It is a security device that combines firewall, antivirus, intrusion prevention, and virtual private network (VPN) capabilities. It can be used as a security solution for both small and large networks. This post is applicable for adding any versions of Cisco ASA 8.2,8.3,8.4 on GNS3. Before we begin.,Please make sure that you have below items in your machine. 1.Download & Install GNS3 http://www.gns3.net/download 2.Cisco ASA 8.4 ISO image(valid) http://www.mediafire.com/download.php?ssadit26tl3llms or https://rapidshare.com/files/2538881267/asa.zip Now Let's assume that, you have installed GNS3 on your machine. Steps to be Followed, Step 1:- Download the ASA image & Extract them. Copy the extracted image & Paste them to GNS3 Images Directory. Ex: C:\Users\<user name>\GNS3\images\ Step 2:-  Open GNS3 --> go to edit---> Preferrence ----> QEMU---> QEMU VMs Step 3:- Click New ---->Select QEMU VM ...