A network can choose any network number other than its external network number as its internal network number. Different networks can use the same network number as their internal number. We propose to reserve one Class A network number as the well-known network number for internal use. The Advantages The DNA scheme attempts to tackle the problem from the bottom of the Internet, i.e., each individual network, while other schemes described in the first section deal with the problem from the top of the Internet, i.e., gateways and exterior routing algorithms. These schemes, however, do not need to be consider as mutually exclusive.
Different networks can individually choose to adopt the scheme at any time only when necessary.
There is no need for global coordination between different networks for their deployment. The effects of the deployment are confined to the network in which the scheme is being implemented, and are invisible to exterior routing algorithms and external networks. With the DNA scheme, it is possible for a medium size organization to use a Class C network number with 254 external addresses. The scheme allows the current Internet to expand to over 2 million networks and each network to have more than 16 million hosts. This will allow considerable time for a long-term solution to be developed and fully tested.