Raritan Computer UST-IP - Manual (Page 55)

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When does UST-IP use
TCP? UDP? Both TCP and UDP are used by UST-IP. However, TCP is essential,
whereas UDP is optional.
UDP is used only for one UST-IP feature, automatic detection (“browse”)
of UST-IP units in a subnet (see Chapter 3: Raritan Remote Client, RRC
Navigator).
If you do not employ the browse feature (and by extension, are not using
DHCP), then UST-IP will only communicate using TCP.