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UniPRO
152810
User Guide
Page 17
Layer 3 (IP).
Good frames are retransmitted and altered so that the Source and Destination MAC
addresses, and, the Source and Destination IP addresses are swapped. This is so that frames sent to the
loopback device’s IP address (Destination IP in the received frame) are returned to the sender’s IP
address (Source IP in the received frame). This loop type can be used over (a) a physical connection or
(b) over a switched network using Layer 2 or Layer 3 switching or (c) over a routed network.
Fig 18 Layer 3 Loop
Layer 4 (UDP).
Good frames are retransmitted and altered so that the Source and Destination MAC
addresses and the Source and Destination IP addresses are swapped as at Layer 3. In addition this loop
type swaps the UDP Source and Destination Port numbers, so that traffic sent to a particular port is
returned from that same port back to the originating port. This loop type can be used over any type of
connection or network.
Fig 19 Layer 4 Loop
Summary of Contents for UniPRO MGig1
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