Download iourc.txt: A Guide for Cisco IOU Users
If you are a network engineer or a student who wants to practice Cisco networking skills, you may have heard of Cisco IOU devices. Cisco IOU stands for IOS on Unix/Linux, which means that you can run Cisco IOS images on Unix/Linux platforms. This is very useful for creating complex network topologies and simulating real-world scenarios. However, in order to use Cisco IOU devices, you need a special license file called iourc.txt. In this article, we will explain what iourc.txt is, how to get it, where to put it, and how to add and run Cisco IOU devices on GNS3 VM.
download iourc.txt
What is iourc.txt and why do you need it?
iourc.txt is a license file for Cisco IOU devices
Cisco IOU devices are not officially supported by Cisco, and they are only intended for internal use by Cisco employees. Therefore, they require a license file to run properly. The license file is called iourc.txt, and it contains a unique code that identifies your GNS3 VM as a valid host for Cisco IOU devices. Without this file, you will not be able to run Cisco IOU devices on GNS3 VM.
iourc.txt allows you to run Cisco IOS images on Unix/Linux platforms
Cisco IOS images are the software that runs on Cisco routers and switches. Normally, you can only run them on real Cisco hardware or on Dynamips, which is a software emulator that simulates Cisco hardware. However, Dynamips consumes a lot of resources and can be slow and unstable. Cisco IOU devices offer an alternative way to run Cisco IOS images on Unix/Linux platforms, which are more efficient and stable than Dynamips. With iourc.txt, you can run Cisco IOS images on GNS3 VM, which is a virtual machine that runs on VMware Workstation or VirtualBox.
iourc.txt is required to use Cisco IOU devices on GNS3 VM
GNS3 VM is a virtual machine that runs GNS3 Server, which is the core component of GNS3 that handles the communication between the graphical user interface (GUI) and the network devices. By using GNS3 VM, you can offload the resource-intensive tasks from your local computer to the virtual machine, and improve the performance and stability of your network simulations. However, if you want to use Cisco IOU devices on GNS3 VM, you need to have iourc.txt in the root folder of GNS3 VM. Otherwise, GNS3 will not recognize your Cisco IOU devices and will not let you add them to your network projects.
How to get iourc.txt and where to put it?
You can get iourc.txt from various sources online
Since iourc.txt is not officially distributed by Cisco, you have to find it online from various sources. Some of these sources are:
: This is a tutorial that shows you how to install and configure Cisco IOU devices on GNS3 VM. It also provides a link to download iour c.txt file for GNS3 VM.
: This is a tool that generates iourc.txt file based on your hostname and hostid. You need to run this tool on GNS3 VM and copy the output to a text file named iourc.txt.
: This is another tool that generates iourc.txt file based on your hostname and hostid. You need to run this tool on GNS3 VM and copy the output to a text file named iourc.txt.
Be careful when downloading iourc.txt file from unknown sources, as they may contain malware or viruses. Always scan the file with an antivirus software before using it.
You need to copy iourc.txt to the root folder of GNS3 VM
Once you have obtained iourc.txt file, you need to copy it to the root folder of GNS3 VM. The root folder is the top-level folder that contains all the files and folders of GNS3 VM. You can access the root folder of GNS3 VM by using a file transfer protocol (FTP) client such as FileZilla or WinSCP. You need to connect to GNS3 VM using its IP address, username, and password. The default username and password are gns3 and gns3, respectively. The default IP address is 192.168.56.101, but you can change it in the settings of GNS3 VM. After connecting to GNS3 VM, you need to navigate to the root folder and paste iourc.txt file there.
You need to configure GNS3 to use iourc.txt as the license file
After copying iourc.txt file to the root folder of GNS3 VM, you need to configure GNS3 to use it as the license file for Cisco IOU devices. To do this, you need to open GNS3 GUI on your local computer and go to Edit > Preferences > Server > Main Server > Advanced Settings. There, you need to check the box that says "Use iourc file located on server" and click OK. This will tell GNS3 to use iourc.txt file from GNS3 VM as the license file for Cisco IOU devices.
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How to add and run Cisco IOU devices on GNS3 VM?
You need to download Cisco IOU images from the internet
Cisco IOU images are the files that contain the Cisco IOS software for Cisco IOU devices. You can download Cisco IOU images from various sources online, such as:
: This is a collection of Cisco IOS images for Dynamips, which can also be used for Cisco IOU devices. You can find different versions and models of Cisco IOS images here.
: This is another collection of Cisco IOS images for Dynamips, which can also be used for Cisco IOU devices. You can find different versions and models of Cisco IOS images here.
: This is a collection of Cisco IOU images specifically designed for Cisco IOU devices. You can find different versions and models of Cisco IOU images here.
Be careful when downloading Cisco IOU images from unknown sources, as they may contain malware or viruses. Always scan the files with an antivirus software before using them.
You need to import Cisco IOU images to GNS3 VM
After downloading Cisco IOU images, you need to import them to GNS3 VM. To do this, you need to open GNS3 GUI on your local computer and go to Edit > Preferences > IOS on UNIX > New. There, you need to browse and select the Cisco IOU image file that you want to import. You also need to specify the name, platform, type, RAM, and number of interfaces for the Cisco IOU device that you want to create based on the image. After filling in all the details, click Finish. This will import the Cisco IOU image to GNS3 VM and create a new template for the Cisco IOU device.
You need to create and configure Cisco IOU devices on GNS3
After importing Cisco IOU images to GNS3 VM, you can create and configure Cisco IOU devices on GNS3. To do this, you need to open a new network project on GNS3 and drag and drop the Cisco IOU device template from the Devices toolbar to the Workspace. You can create as many Cisco IOU devices as you want, depending on your network design. To configure the Cisco IOU devices, you need to double-click on them and open their consoles. There, you can enter the Cisco IOS commands to set up the device name, IP address, routing protocol, interface settings, and other parameters. You can also connect the Cisco IOU devices to each other or to other network devices using the Add a Link tool from the Tools toolbar. You can use different types of links, such as Ethernet, Serial, or Frame Relay, depending on your network requirements.
Conclusion
In this article, we have explained how to download iourc.txt file and use it to run Cisco IOU devices on GNS3 VM. We have also shown how to import Cisco IOU images to GNS3 VM and create and configure Cisco IOU devices on GNS3. By following these steps, you can create realistic and complex network simulations using Cisco IOU devices and practice your Cisco networking skills. We hope you have found this article helpful and informative. If you have any questions or feedback, please feel free to leave a comment below.
FAQs
What is the difference between Cisco IOU and Cisco IOSv?
Cisco IOU and Cisco IOSv are both virtualized versions of Cisco IOS software that run on Unix/Linux platforms. However, Cisco IOU is an older and unofficial version that is not supported by Cisco, while Cisco IOSv is a newer and official version that is supported by Cisco. Cisco IOSv is also more compatible with GNS3 and does not require iourc.txt file to run.
How can I get iourc.txt file legally?
The only legal way to get iourc.txt file is to be a Cisco employee or a partner who has access to Cisco IOU devices for internal use. Otherwise, you have to rely on unofficial sources online, which may be illegal or unethical.
How can I verify that iourc.txt file is working properly?
You can verify that iourc.txt file is working properly by checking the status of your Cisco IOU devices on GNS3 VM. To do this, you need to open GNS3 GUI on your local computer and go to Tools > GNS3 VM > Control Panel > Devices. There, you should see a green check mark next to your Cisco IOU devices, indicating that they are licensed and running.
How can I update or change iourc.txt file?
If you want to update or change iourc.txt file, you need to repeat the steps of copying it to the root folder of GNS3 VM and configuring GNS3 to use it as the license file. You may also need to restart GNS3 VM and reload your network project for the changes to take effect.
How can I troubleshoot common issues with iourc.txt file?
Some of the common issues with iourc.txt file are:
The iourc.txt file is corrupted or invalid: You may need to download a new iourc.txt file from a different source or generate a new one using a tool.
The iourc.txt file is not in the root folder of GNS3 VM: You may need to check the path of the iourc.txt file and make sure it is in the correct location.
The iourc.txt file is not recognized by GNS3: You may need to check the box that says "Use iourc file located on server" in the advanced settings of GNS3 Server.
The iourc.txt file does not match your hostname or hostid: You may need to check your hostname and hostid on GNS3 VM and make sure they match the ones in your iourc.txt file.
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