This is a port of the lwIP IP stack over to the Nintendo DS.
The wireless side of things is based on the dswifi library. Thankfully Stephen Stair put in hooks to allow for the dswifi library's IP stack implementation to be replaced.
If you want to discuss or ask questions about the port venture over to the gbadev.org forums.
This is a very early release and somethings do not work. If you find any problems and/or fixes let me know.