Networks created within the openstack platforms are not routed trough NTNU, and it is thus in theory not important exactly what subnet is selected. It might however present a problem if the address range selected overlaps with address ranges used elsewhere, in case your virtual machines would like to contact external resources with the same addresses as its local network. Because of this it is normal to create network within the RFC1918 ranges:
- 10.0.0.0/8
- 172.16.0.0/12
- 192.168.0.0/16
RFC1918 within NTNU
NTNU are however using quite a few subnets within the RFC1918 range, and these subnets should thus be avoided:
- 10.0.0.0/8 - Large pieces of this range is already in use; and this block is likely to be used in new subnets within NTNU as well. It is thus recommended to not use this block at all.
- 172.16.0.0/16 - Used as floating-IP's in skyhigh.hig.no; free in other clouds
- 172.17.0.0/16 - Used within NTNU in Gjøvik, and is thus not recommended used in openstack networks.
- 192.168.0.0 - Partly used in NTNU Ålesund (subnets listed below). The rest is free.
- 192.168.10.0/24
- 192.168.30.0/24
- 192.168.50.0/24
- 192.168.90.0/24
- 192.168.110.0/24
- 192.168.114.0/24
- 192.168.201.0/24
- 192.168.212.0/24
- 192.168.221.0/24
- 192.168.222.0/24
- 192.168.223.0/24
- 192.168.224.0/24