OK, I think I'm starting to get a hint on what you do have and what you are trying to do. You seem to have a packet radio system, and you seem to need to route IP over that packet radio system. I will assume that you already studied and know your packet radio system and you are sure it does not have its own way of handling IP frames with AX25 or other similar stuff. In such a case, you need to build your router, either out or inside lwIP. I guess you already decided to build it on a netif, and I guess the SLIP code will allow you to build a static routing table to accomplish some sort of mapping from IP address to radio address. You might get some clues and directions if you ask the guys at AMPRNet or study AX25, KISS, 6PACK. Good luck.
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