/sys$common/syshlp/helplib.hlb TCPTRACE, Qualifiers, /PORT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /PORT ={LOCAL | REMOTE}= n

    Optional. Default: Trace all port numbers.

    Specifies the local or remote port number to trace. Use in
    conjunction with the /PROTOCOL qualifier to filter tracing to
    an exact port and protocol.