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DNScat is a DNS tunnel software written in Java by Tadeusz Pietraszek and licensed under the GPL open source license. It uses PPP to provide a VPN.

Other implementations of a DNS tunnel include OzymanDNS, iodine, DNS2TCP, NSTX, and TUNS. A ICMP tunnel works similar to a DNS tunnel.

The latest version is 0.02 from 27. August 2005.