metrotek Bercut-MMT, Operation Manual

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64 Loopback
Figure 11.2. Second Layer Loopback Connection
Legend:
• MAC Dst — recipient’s MAC address;
•
MAC Src — sender’s MAC address;
•
IP Dst — recipient’s IP address;
•
IP Src — sender’s IP address.
11.1.3 Third Layer Loopback
Incoming traffic is redirected back at the network layer (defective packets are
not transmitted), with this, in addition to switching of MAC addresses, sender
and recipient IP addresses are switched; another (user defined) MAC and IP
addresses can be inserted, also ToS and VLAN tags can be changed.
Figure 11.3. Third Layer Loopback Connection For One Port
11.2 Loopback Configuration
To activate this application, the Loopback Configuration program can be
used (refer to Figure 11.4, page 65), through an access to
O-Menu ⇒ Ethernet Testing ⇒ Loopback Configuration .
Application main window layout is shown at the following Figure:
Bercut-MMT: Ethernet Networks Analysis