VM on Proxmox Single Host with 4-Port Broadcom Network Card: VMs Lose Internet After Service Reload

VMs Lose Internet Service After Reloading on Proxmox Single Host with 4-Port Broadcom Network Card (Dell R730)

Proxmox is a popular open-source server virtualization management solution that allows users to create and manage virtual machines (VMs) and containers. When running Proxmox on a single host with a 4-port Broadcom network card, such as the one found in a Dell R730 server, users may encounter issues where VMs lose internet service after being reloaded.

Understanding the Network Configuration in Proxmox

In Proxmox, the network configuration is managed by the Linux bridge, which is a software-based bridge that connects virtual and physical network interfaces. The Linux bridge allows VMs to communicate with each other and with the outside world. In this case, the 4-port Broadcom network card is connected to the br0 bridge, which is the default bridge in Proxmox.

When a VM is created, it is assigned a virtual network interface that is connected to the br0 bridge. This allows the VM to communicate with the outside world through the physical network interface connected to the br0 bridge. However, if the VM is reloaded, the virtual network interface may be disconnected from the br0 bridge, causing the VM to lose internet service.

Identifying the Problem

To identify if this is the problem, users can check the network configuration of the VM by running the following command:

This command will display the network interfaces and their configurations. If the VM's virtual network interface is not connected to the br0 bridge, then this is the cause of the problem.

Fixing the Problem

To fix this problem, users can reload the VM and manually connect the br0 bridge to the virtual network interface. This can be done by running the following command:

Where vmeth0 is the name of the virtual network interface. This command will add the virtual network interface to the br0 bridge, restoring the VM's internet service.

Preventing the Problem

To prevent this problem from occurring in the future, users can configure the Proxmox network to automatically connect the virtual network interface to the br0 bridge when the VM is reloaded. This can be done by editing the VM's network configuration file and adding the following line:

This will ensure that the virtual network interface is always connected to the br0 bridge, even after the VM is reloaded.

In conclusion, users of Proxmox single host with 4-port Broadcom network card (Dell R730) may encounter issues where VMs lose internet service after being reloaded. This is caused by the virtual network interface being disconnected from the br0 bridge. By manually connecting the br0 bridge to the virtual network interface or configuring the network to automatically connect the virtual network interface to the br0 bridge, users can prevent this problem from occurring in the future.

References

• Proxmox VE: Network Configuration
• Proxmox VE: Troubleshooting Network Issues
• Broadcom NetXtreme II 5709 Gigabit Ethernet

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