This is a piece of software that 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 runs on Linux, Windows, Mac OS X, FreeBSD, NetBSD and OpenBSD and needs a TUN/TAP device. The bandwidth is assymetrical with limited upstream and up to 1 Mbit/s downstream.
There are no reported vulnerabilities