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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

    not

    use this block at all:

    Broadcast10.255.255.255
    HostMin10.0.0.1
    HostMax10.255.255.254
    Max amount of hosts16777214
  • 172.16.0.0/16 - Used as floating-IP's in skyhigh.hig.no; free in other clouds

    Broadcast172.16.255.255 
    HostMin172.16.0.1
    HostMax172.16.255.254
    Max amount of hosts65534
  • 172.17.0.0/16 - Used within NTNU in Gjøvik, and is thus not recommended

    used

    to use it in openstack networks.

    Broadcast172.17.255.255   
    HostMin172.17.0.1
    HostMax172.17.255.254
    Max amount of hosts65534
  • 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