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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. The general purpose floatin-IP's assigned in openstack is also from this range, and it can thus involve a bit of confusion if both the vm's IP and the floating-ip looks the same. It is thus recommended not to use this block at all.
- 172.17.0.0/16 - This is the default subnet for docker, and might give you all kinds of weird behavior