This is an old revision of the document!
Table of Contents
ifup and ifdown
Apr 2020
Overview
If have been using ifup and ifdown for quite some time now, and as far as i was aware the syntax was pretty simple, however I got really caught out the other day and wanted to share what I discovered (not entirely on my own, with the help of some other, way more clever people).
Simple Syntax
So, to take down an interface, I would use the following:
ifdown eth1
Device 'eth1' successfully disconnected.
Simple, and to bring that interface back up:
ifup eth1
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/3)
Wow, too easy. I use this normally when I have changed and IP Address and want to invoke that change quickly (without using the systemctl command or a reboot).