Hotplug, /etc/network/interfaces and ifup

Raphaël Berbain raphael.berbain at
Thu Jul 7 17:57:54 UTC 2005

* Jaime:

> Hi.
> I have a working installation of Ubuntu Hoary on my laptop which is
> doing just one thing I can't understand. It has one ethernet card (3com
> 3c556b minipci) network card with a "normal" config (private ip address
> on internal network, etc). A boot time, hotplug brings the card up: the
> installer leaves /etc/network/interfaces with the lines:
> auto lo
> mapping hotplug
>     script grep
>     map eth0
> When I use "ifup eth0" and "ifdown eth0", everything works just fine.
> Just as a test, I added the line:
>     up logger canYouFindThis
> to the eth0 stanza in the interfaces file, and a quick "tail
> -f /var/log/syslog" shows me that everytime I "ifup eth0", the message
> is logged.
> The bit I don't understand is that if I leave the logger line in the
> interfaces file, nothing gets logged during boot-up. All the
> documentation I've read talks about "ifup eth0=hotplug" being run during
> bootup - I've even tried doing this manually and even that works, so why
> is nothing logged when the machine boots?

The boot messages say syslog starts after hotplug brings up the

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