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Which of the following is a legitimate use for tcp-over-dns?


Firewall evasion


Tunneling through a firewall is a great evasion technique, and the tcp-over-dns tool accomplishes this by tunneling over the Domain name System(DNS).
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Port 53 is usually open on firewalls because... well, everything uses and needs DNS.


The tcp-over-dns tool takes advantage of that.


As as aside, it also requeires Java runtime environment 6.0 or later and is supported on Windows, Linux, and Solaris.