Networks created within the openstack platforms are not routed trough NTNU, and it is thus in theory it is not important exactly what which subnet is selected. It might however present be a problem if your virtual machine needs to contact external resources and you have provision your virtual machines within the same address range selected overlaps with address ranges used that is currently being use 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 rangescausing your local address range to overlap with the address range of another network. Because of this, it is common practice to use the address ranges specified in the RFC1918 (a.k.a IPv4 Private Address Space):
- 10.0.0.0/8
- 172.16.0.0/12
- 192.168.0.0/16
RFC1918 within NTNU
NTNU are is however using quite a few the following subnets within the RFC1918 range, and these subnets should thus therefore their use should 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 not to
notuse this block at all:
Broadcast 10.255.255.255 HostMin 10.0.0.1 HostMax 10.255.255.254 Max amount of hosts 16777214 172.16.0.0/16 - Used as floating-IP's in skyhigh.hig.no; free in other clouds
Broadcast 172.16.255.255 HostMin 172.16.0.1 HostMax 172.16.255.254 Max amount of hosts 65534 172.17.0.0/16 - Used within NTNU in Gjøvik, and is thus not recommended
usedto use it in openstack networks.
Broadcast 172.17.255.255 HostMin 172.17.0.1 HostMax 172.17.255.254 Max amount of hosts 65534 - 192.168.0.0 - Partly The following twelve subnets are partly used in NTNU Ålesund (subnets listed below). The rest is free., the rest are free:
192.168.10.0/24
Broadcast 192.168.10.255
HostMin 192.168.10.1
HostMax 192.168.10.254
Max amount of hosts 254
- 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