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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   TUBA
      <networking, protocol> An Internet protocol, described in
      RFC 1347, RFC 1526 and RFC 1561, and based on the OSI
      Connectionless Network Protocol (CNLP).
      TUBA is one of the proposals for Internet Protocol Version
    6.
      (1995-04-03)