Awesome

utoepy - UDP to Ethernet and back, in Python.

Python scripts to forward data from a UDP port to an Ethernet interface and back. Scripts allow setting Ethertype parameter.

The purpose of these scripts is to be a "Link Layer entity" for a GeoNetwroking implementation.

For a Python-free AF_PACKET-based Linux-only alternative, see udp2eth.

The scripts require PcapPy, dpkt and netifaces (requires python-dev). Install them with:

easy_install pcappy
pip install  dpkt  netifaces