Xtramus DApps-TAP V1.3 - Manual (Page 43)

Port AB_Loopback
If you choose the TAP mode on
Loopback interface, the NuDOG-301C,
NuDOG-801 and NuDOG-101T
operates like a hardware device that
provides a method to access and
monitor the data streams flowing across
two network ports without intruding the
running network.
If you choose the Layer 1 Loopback
Mode on Loopback interface, the
NuDOG-301C, NuDOG-801 and
NuDOG-101T filters out broadcast,
multicast and null DA (destination
address) packets of incoming data
streams, and then resends them back to
the same connected port.
If you choose the Layer 2 Loopback
Mode on Loopback interface, the
NuDOG-301C, NuDOG-801 and
NuDOG-101T filters out broadcast,
multicast and null DA (destination
address) packets of incoming data
streams, and then resends them back to
the same connected port with swapped
DA / SA (destination / source MAC
address) and recalculated CRC.
If you choose the Single-End Mode on
Loopback interface, the selected ports
are idle that all transmitting and/or
receiving data streams via these ports
are disabled.
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