How to Fix uBridge Root Access Error in GNS3

Are you getting this error while using the GNS3 network simulator on Linux systems? The error message is: Root Access requires root access or the capability to interact with network adapters.

If so, you need to change the access permissions of the uBridge folder. By following the steps in this article, you will be able to run GNS3 without any problems!

What is uBridge in the GNS3 Emulator Program?

uBridge does a serious job on the GNS3 network emulator. We use it to integrate virtual machines into GNS3, especially with virtualization software like VMware Workstation.

uBridge also provides connectivity between different technologies. It supports Ethernet and UDP tunnels, TAP interfaces, and packet capture.

uBridge Root Access Error Solution

After installing GNS3 on Linux systems, you may sometimes see the uBridge Root Access error. Although solving this problem is pretty simple, it can sometimes be challenging.

When you started GNS3, you may have clicked the No option when you saw the uBridge information window. In short, this is why you are getting this error. Because of that, this additional software cannot interact with network adapters without root access.

Let’s say you are using the Linux-based Ubuntu operating system on your host PC. In this case, let’s assume you have received a uBridge error. Now, sit back and follow the steps below to fix this error.

I would also like to point out that you should check the right guide to avoid such errors. That’s why I have previously prepared a GNS3 installation guide on Ubuntu for you. By checking out this guide, you can install your program without any problems.

Now let’s get rid of the uBridge trouble!

Step 1

Let’s say you just did the installation process and ran the GNS3 program. Then, add a Cisco Router to the working environment. As seen in the image below, you will encounter an error as soon as you run the Router.

Of course, when you get this error, your Router will not work, and the program will stop.

Step 2

If you encounter the same problem as in the image above, I recommend that you first close your GNS3 software.

Step 3

Later, when you open the network emulator again, you will see the information window as below. At this stage, continue by clicking the Yes button in the window you see.

Step 4

The relevant window asks you to enter your Root password. Therefore, type your Root password and click OK.

Step 5

Now restart your Cisco Router to check for problems. You can do this directly by clicking the green OK in the menu or by right-clicking on the device.

Step 6

If you examine the image below, you will not encounter the uBridge error this time. If so, of course, the Cisco Router will work!

Let’s say the error persists, open Terminal, and apply the commands I gave you below.

cd /usr/bin/
sudo chmod 777 ubridge
Copy

What Commands Can I Use in the Terminal If The Error Persists?

If the uBridge error persists, you can use some commands in the Terminal. However, remember that the commands vary depending on the type of error and the operating system. However, you can still try and test these steps:

1. Checking Permissions

Use the “ls -l” command to review the permissions of the folder. If there are problems with permissions, you can change them with the “chmod” command.

bash
sudo chmod 755 /path/to/ubridge/folder

2. Verifying User Groups

Make sure that the user account running GNS3 is in the appropriate groups. For example, it should belong to the sudo or admin groups. You can utilize the groups command to see the user’s groups.

3. Restarting Network Services

You can restart the network services or network stack. For example, in Ubuntu, you can use the following command:

sudo systemctl restart network-manager

4. Checking Logs

Search for messages related to this error in the system logs. You can check the dmesg command or the log files in the /var/log directory.

These commands provide an additional method for general troubleshooting. However, for persistent problems, I recommend following your operating system and error messages. Also, don’t forget to check out the official sources of GNS3!

Conclusion

We fixed the uBridge bug for GNS3 software on Linux systems, achieving a smooth network simulation. If you follow these steps, you can make the Cisco emulator work properly.

You can also effectively integrate virtual machines and various technologies. In short, if you cannot solve your problem, do not hesitate to contact us!