Several ACN members have private networks in the 172.16/12 block (of RFC 1918) and are using OpenVPN to link them together. Currently all routing is static, but work is being done to move to a dynamic routing protocol (probably BGP).

Netblock	Contact	Central Router
172.17/16	ThomasKula	Yes
172.27.72.0/21	JonathanKollasch	No
172.20/16	Waldo	Yes

"Central Router" means is willing to act as a connection point for other private networks.

UniqueLocalAllocationPlan -- private IPv6 from ACN space
WireLess -- addressing for wireless nodes
RoutingNodes