Description:

odine 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.

The bandwidth is asymmetrical with limited upstream and up to 1 Mbit/s
downstream.

Compared to other DNS tunnel implementations, iodine offers:

* 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
iodine 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
iodine 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.