Connection of Extruded Subnets: A Solution Based on RSIP

Many remote computers need to be securely connected to their organization main network through a public IP network (e.g. Internet). Our purpose is to integrate as seamlessly as possible remote networks in the organization network, i.e. to put these in exactly the same situation as if they were located inside the organization. After summarizing the state of the art, the paper presents a solution based on RSIP, to dynamically allocate an IP address of the organization to a host of the remote network requesting an external access. Security is provided by IPSec. We compare this solution with a former proposal based on DHCP and show that the two solutions are very close but that RSIP brings us closer to an ideal situation but at an extra cost.