Comment 4 for bug 16426

<mdz> kiko: the right approach is for it to be called when the network interface
is brought up, and not by init at all
<kiko> mdz, doesn't that invalidate your comment
https://bugzilla.ubuntu.com/show_bug.cgi?id=10126#c1
<mdz> kiko: no, ip-up.d is still run synchronously