This can be usable in different situations where internet access is firewalled, but DNS queries are allowed.iodine runs on Mac OS X, Linux, FreeBSD, NetBSD and OpenBSD and needs a TUN/TAP device.The bandwidth is assymetrical with limited upstream and up to 1 Mbit/s downstream.The name iodine was chosen since it starts with IOD (IP Over DNS) and sinceiodine has atomic number 53, which happens to be the DNS port number.NOTE: iodine is licensed and distributed under the terms of the ISC license.Here are some key features of \"iodine\":