VMS Help  —  tcpdump  Parameters
 expression

    A boolean expression that provides a filter to select the packets
    to dump. If you do not specify the expression, all packets on
    the network are dumped. Otherwise, only packets that match the
    expression are dumped.

    For information about specifying expressions, see the HP TCP/IP
    Services for OpenVMS Tuning and Troubleshooting guide.
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