I can highly recommend reading RFC1365 ( http://www.faqs.org/rfcs/rfc1365.html http://www.faqs.org/rfcs/rfc1365.html ) which defines IP extension blocks to prov

I can highly recommend reading RFC1365 ( http://www.faqs.org/rfcs/rfc1365.html http://www.faqs.org/rfcs/rfc1365.html ) which defines IP extension blocks to provide huge address spaces within IPv4 while retaining full downward compatibility with legacy routers and hosts. Such extension blocks should also be compatible with NAT and jumbo frames.