Currently there are some differences in how to access the virtual machines based on which openstack installation you are working on.
stack.it.ntnu.no
Currently the openstack installation in trondheim (stack.it.ntnu.no) uses addresses which is routed troughout the NTNU campus. To contact a virtual machine in this cloud you would simply just create a floating IP, assign it to the VM, allow traffic trough the security group and then connect to the machine. In the case you are off-campus you can VPN (sslvpn.ntnu.no) to the campus first.
skyhigh.hig.no
The openstack installation at Gjøvik (SkyHiGh) is currently addressed using private IP addresses which is not available troughout the campus. There are a couple of alternatives on how to connect to the virtual machines in this cloud:
Get assigned a global IP
SkyHiGh has a few global addresses. If your project is of such a kind that global addresses is required it is possible to NAT in a global address to an internal floating IP. Then this floating IP can be assigned to a virtual machine; and this virtual machine is then accessible trough the assigned global IP from NTNU campus. Be aware that NTNU IT enforces some firewalling entering that subnet; so services hosted there needs to be coordinated with them to be campuswide available.
Trough a jumphost
All floating IP's within skyhigh is accessible to all machines in the cloud (if permitted by the access groups). All users with an active project in skyhigh is able to log in to "skyhigh.hig.no", and trough that machine it is possible access all other machines. This machine also allows ssh-tunnels to tunnel other traffic trough SSH (f.ex RDP, HTTP(S) and similar).
PPTP VPN
If you would like to have IP connectivity between your machine and machines in skyhigh directly, without using SSH tunneling, there are a PPTP VPN service available. Please contact Eigil or Lars Erik for credentials to this service.