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· 5 min read


A long time ago (2006), When I was still graduating in computer science, I’ve made a video showing the communication between 2 openBSD VMs configured with non-contiguous network masks (eg: or talking to each other.

At that time, I tried to use non-contiguous masks on Windows, Linux (Gentoo?), FreeBSD and OpenBSD. Only OpenBSD was able to make this kind of configuration.

Maybe having subnets with non-continuous masks aren't useful at all, but what about firewalls/filters? Having this possibility can be good and suppress some (many?) lines of rules depending on your scenario.