[Users] How-to NAT / host-only virtual machine network

[Alexander von Gluck]

Found a way to get easy NAT / host only virtual networks in oVirt 3.4.  I
didn't see this documented, so posting it here:

 1. Create a fake ethernet card
    - ip link set name vmnet0dummy dev dummy0

Now you can create a new network (bridge) named vmnet0, and attach it to
vmnet0dummy.

The issue is that as posted on
http://www.ovirt.org/Features/Nicless_Network#Benefit_to_oVirt:
"
I am told that implementing this in Engine is quite a pain, as network
external interfaces are currently used as keys. A network without nics is
currently unsearchable.
"

You'll need to figure out your own dhcp / NAT using libvirt or something
running on your server, but a *lot* easier and less hacky than
http://lists.ovirt.org/pipermail/users/2012-April/001751.html :-)

 -- Alex
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