iodine | tool for tunneling IPv4 data through a DNS server | Mehr ...
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. . iodine is similar to nstx but has password authentication, brings up the tun interface automatically and lets the user specify the IP address as a command line option.
