from my point of view, it is a bug: I build a new diskless rootfs based
on Squeeze and most works, but NFS mounts from /etc/fstab. I search a
very long time, whats the reason and found it. This enries are only
mounted, if the if-up.d/mountnfs is executed. But in my case, it doesn't
work, because I get all information for the eth0 from initramfs/kernel,
so the device is up and running. if-up.d/mountnfs is never executed.
In my case I had luck, because I have a second network card, configured
with a static IP and if-up.d/mountnfs is executed. I think, there must
be a better way to check, if the network is reachable.