Ham Radio
Due to time constraints, I have been forced to turn-down the wa6epd.ampr.org (WA6EPD-3) station on 144.930 MHz. Amateur Packet Radio, especially, TCP/IP based Packet, has proven to be an invaluable teaching tool for present-day Networking and protocol knowledge. Below are some links to sources of valuable information regarding TCP/IP based Packet Radio.
The source for some very good information on Packet Radio in general is TAPR.