Date: Thu, 1 Nov 2012 16:40:21 +0100
From: Natanael Copa <ncopa@alpinelinux.org>
To: Der Tiger <der.tiger.alpine@arcor.de>
Cc: "alpine-devel@lists.alpinelinux.org"
 <alpine-devel@lists.alpinelinux.org>
Subject: Re: [alpine-devel] [Alpine 2.4] Network Interface Hotplugging
 Detection
Message-ID: <20121101164021.49481c5f@ncopa-desktop.nor.wtbts.net>
In-Reply-To: <509188C2.7080209@arcor.de>
References: <509147AC.8030105@arcor.de>
	<20121031205406.79aa5da2@ncopa-laptop.res.nor.wtbts.net>
	<509188C2.7080209@arcor.de>
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On Wed, 31 Oct 2012 21:23:30 +0100
Der Tiger <der.tiger.alpine@arcor.de> wrote:

> Hi Natanael,
> 
> Thanks for your prompt reply!
> 
> >> It seems Alpine does not detect link up and down events on NICs.
> > What kernel is it?
> That's 3.4.13, but I can reproduce the behaviour at least down to 3.3.
> 
> > Does it happen with intel nic too?
> I'm not sure. I'll have to verify that ASAP.
> 
> > Does it happen with v2.4.5 iso (with 3.3 kernel)
> Yepp, it does.
> 
> >> AFAIK, link up and down events are usually handled by daemons like
> >> ifplugd, netplugd or hotplug
> > add dhcpcd to that list.
> Didn't know that. That's, of course, a lead to follow. I'm going to
> check the dhcpcd configuration, tomorrow.

I just remembered. I think you can run dhcpcd in 2 ways.
1) configure the interface as 'dhcp' in /etc/network/interfaces and let
   busybox ifup it.

2) remove all interfaces (maybe except lo) from /etc/network/interfaces
   and then run dhcpcd as standalone. 'rc-service dhcpcd start'
   and 'rc-update add dhcpcd'. dhcpcd will by default give all
   interfaces a dhcp address on link detection. You can configure it to
   ignore given interfaces, and set static ip address on link detect
   in /etc/dhcpcd/dhcpcd.conf


I'm not sure if the link detection is enabled in mode #1 but i know for
sure that mode #2 works.

-nc


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