It appears the AVR parts really do not have any support for ethernet except in the 32 bit parts. However, I'm wondering if it is feasible to pass audio over the LAN using an AVR board at each end of the link. The application I am thinking of would send 10-15 seconds of audio a few (< 10) times per day. I would use a Codec to process the audio at each end so the AVR would not have to deal with that task.
I'm believe that using UDP and just having the remote end constantly listen on a specific port would be good enough. I think trying to use RTP would be difficult. In my application if the transmission gets corrupted, well, that's just the way it is.
Has anyone attempted something like this? If so, what were the results?