TheDNSMuseum
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Tunnelling

DNS tunnelling

DNS tunnelling encodes data in query names and answers to create a constrained communications channel, a pattern with both legitimate and harmful uses.

tunnellingtransportrecord types

Date updated:

Screenshot used in the talk for DNS tunnelling
Screenshot used in the original talk.

DNS tunnelling encodes data into query names and responses, then uses DNS as a transport channel. The idea was discussed publicly as early as 2000.

Many record types can carry pieces of a tunnel. The later entries in this section show what people built on top of that basic pattern.

Primary source: https://www.daemon.be/maarten/dnstunnel.html