VMS Help TCPTRACE, Examples  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    1.$  TCPTRACE HOST1 /FULL /PORT=REMOTE=21

      Traces packets for host HOST1 and remote port number 21.
      TCPTRACE provides a full display of the packets contents.

    2.$  TCPTRACE HOST2 /FULL /PORT=(LOCAL=23, REMOTE=1056) -

      _$  /PACKETS=30 /OUTPUT=TELNET_TRACE.TXT)

      Traces packets for host HOST2 with a local port of 23 and
      remote port number of 1056. TCPTRACE provides a full display
      of the packets contents. TCPTRACE continues the trace for 30
      packets and writes the output to the file TELNET_TRACE.TXT in
      the current directory.