On Sun, 2 Oct 2005, Lore wrote:
I'm writing (tonight/tomorrow it will be finally tested on different networks) a daemon for linux that keeps tcp connections alive on multihoming devices. It works as follows: when a linux box with multiple network interfaces creates a tcp connection with another host (both running the daemon), for instance via an ethernet adapter, it can leave the current media and keep up the tcp connection using one of the others adapters available (fiber, wireless, gprs) or (in the case of simple ip reconfiguration) it can simply move from an access point with a particular subnet to another (with a completely different subnet), without interrupting the connection.
In the simplest case where only the media changes but the IP network is the same no changes at all is required other than to bring up/down the different network connections.
For the more complex case where one has to be able to move between different IP networks with preserved connectivity one normally implements something like this by using tunnelling by IPIP, GRE, IPSec, OpenVPN or similar.
How does your approach compare to these alternatives? Regards Henrik
