История изменений

https://www.debian.org/doc/manuals/debian-reference/ch05.en.html#_the_basic_n...

5.5.13. The basic network reconfiguration

When you try to reconfigure the interface, e.g. eth0, you must disable it first with the «sudo ifdown eth0» command. This removes the entry of eth0 from the «/etc/network/run/ifstate» file. (This may result in some error message if eth0 is not active or it is configured improperly previously. So far, it seems to be safe to do this for the simple single user work station at any time.)

You are now free to rewrite the «/etc/network/interfaces» contents as needed to reconfigure the network interface, eth0.

Then, you can reactivate eth0 with the «sudo ifup eth0» command.

https://www.debian.org/doc/manuals/debian-reference/ch05.en.html

5.5.13. The basic network reconfiguration

When you try to reconfigure the interface, e.g. eth0, you must disable it first with the «sudo ifdown eth0» command. This removes the entry of eth0 from the «/etc/network/run/ifstate» file. (This may result in some error message if eth0 is not active or it is configured improperly previously. So far, it seems to be safe to do this for the simple single user work station at any time.)

You are now free to rewrite the «/etc/network/interfaces» contents as needed to reconfigure the network interface, eth0.

Then, you can reactivate eth0 with the «sudo ifup eth0» command.