For the installation on pve-proxmox, I use the iso for the i386 arch.
I tried with amd64 and it didn't find /dev/console and for the moment I didn't search why.
And NetBSD doesn't seem to recognize virtIO hard drive. (I don't why for the moment)
All isos can be finded in :
ftp://iso.fr.netbsd.org/pub/NetBSD/iso/5.1.2/ (french mirror)
At boot, we lanch the installer without acpi neither smp (it makes NetBSD slow)
The first part of the installation is identifying of drive and partitioning.
after that is the installation of the system and you have plural choice :
-> from CD
-> from HTTP or FTP
-> from NFS
For testing network card, I use FTP.
The first step is configuring network (in our case, it's here that NetBSD says that there are no usable network adapter) dhcp or static as you want.
The second one is set the FTP parameters, I use
host : ftp.fr.netbsd.org (still french mirror)
base directory : pub/NetBSD/NetBSD-5.1.2
sets directory : i386/binary/sets/
The others field can keep their value.
After that, the installer will download and extract all it need and ask you question about root password, password storage, login shell etc...
Sorry for my poor English, I'm french
Post scriptum :
I found an article which may interess
->
http://www.ezunix.org/index.php?title=NetBSD_5_on_KVM