ubuntu get mac address linux get mac address

Ubuntu and Linux: How to Get a Specific MAC Address

When setting up a bonding device in Ubuntu or Linux, it's essential to understand how the MAC (Media Access Control) address is assigned. In this article, we'll explore how to get a specific MAC address for your bonding device.

By default, the first network interface connected to the bonding device determines its MAC address. This can lead to inconsistencies between reboots, causing problems with certain applications or services. For example, if you have two interfaces, p9p1 and p10p1, and the first one is plugged in, it will determine the bonded device's MAC address.

To ensure a specific MAC address for your bonding device, you can set a static MAC address. This can be done by using the 'auto' keyword in the /etc/network/interfaces file. For example:

```

auto bond0

```

You can also use the ip link command to view all network interfaces and their corresponding MAC addresses.

However, it's important to note that this behavior has been reported as a bug (#1288196) with Ubuntu, but no fix has been implemented so far. As a result, you may need to work around this issue by using other methods or configurations.

Another consideration is IPv6 with SLAAC (Stateless Auto Configuration). This can also lead to inconsistencies in MAC address assignment, which may cause problems with certain applications or services.

In conclusion, when setting up a bonding device in Ubuntu or Linux, it's essential to understand how the MAC address is assigned and how to set a specific MAC address for your bonded device. By following these guidelines, you can ensure consistency and avoid potential issues.

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