Comment 5 for bug 20073

More investigation shows a couple of problems:

- the main one is that net.agent reckons that both my network cards are mapped
to eth1. If I turn on debuging (DEBUG=1 in /etc/default/hotplug) then I see:

invoke ifrename for eth0
iface eth0 is remapped to eth1
invoke ifrename for eth1
iface eth1 is remapped to eth1

This obviously causes "ifup eth1=hotplug" to be invoked twice, while my network
card is actually eth0

my /etc/iftab contains:

eth0 mac 00:80:c8:e0:0c:a6
eth1 mac 00:50:8d:4c:40:30

I think the problem is that ifrename is invoked as:

ifrename -t -i eth0 (which maps eth0 to eth1)

and then as

ifrename -t -i eth1 (perhaps this picks up the newly mapped eth1 rather than the
eth1 that needs mapping to eth0)

- The other problem is that there is a huge race condition on bringing up the
interfaces. The net.rc script sleeps waiting for a file to be removed, but by
the time it has reacted, some other init scripts may have been called that
needed the network to be up.