In Linux, the ifdown command is used to bring down a network interface. When you use the ifdown command to bring down a virtual network interface (i.e., an interface with a name of the form eth0:0, eth0:1, etc.), it may bring down all other virtual network interfaces on the same physical interface (e.g., eth0).
This behavior is due to the way that virtual network interfaces are implemented in Linux. When you create a virtual network interface, it shares the same physical interface (e.g., eth0) as the primary interface. When you bring down a virtual network interface, it also brings down the primary interface, which in turn brings down all other virtual network interfaces that are using the same physical interface.
To avoid this behavior, you can use the ifdown command with the --force flag to bring down a virtual network interface without affecting the other virtual interfaces or the primary interface. For example:
ifdown --force eth0:0Source:wwttual.wuri.com
This will bring down the eth0:0 virtual network interface without affecting the other virtual interfaces or the primary interface.
You can find more information about the ifdown command and its options in the ifdown man page by running man ifdown in a terminal.