iodine lets you tunnel IPv4 data through a DNS server.
This can be usable in different situations where internet access is firewalled, but DNS queries are allowed. It needs a TUN/TAP device to operate. The bandwidth is asymmetrical, with a measured maximum of 680 kbit/s upstream and 2.3 Mbit/s downstream in a wired LAN test network. Realistic sustained throughput on a Wifi network using a carrier-grade DNS cache has been measured at some 50 kbit/s upstream and over 200 kbit/s downstream. iodine is the client application, iodined is the server.
This is free and open source software.
Features include:
- Higher performance – iodine uses the NULL type that allows the downstream data to be sent without encoding. Each DNS reply can contain over a kilobyte of compressed payload data.
- Portability – iodine runs on many different UNIX-like systems as well as on Win32. Tunnels can be set up between two hosts no matter their endianness or operating system.
- Security – uses challenge-response login secured by MD5 hash. It also filters out any packets not coming from the IP used when logging in.
- Less setup – handles setting IP number on interfaces automatically, and up to 16 users can share one server at the same time. Packet size is automatically probed for maximum downstream throughput.
Website: code.kryo.se/iodine
Support: GitHub Code Repository
Developer: Erik Ekman
License: ISC License
iodine is written in C. Learn C with our recommended free books and free tutorials.
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