metrotek Bercut-ET, Operation Manual

Page: 24 / 116

24 Analysis. Typical tasks and solutions
Figure 5.8. Connection scheme 4
The scheme 5.5 shows the connection of the analyzer (using one analyzer’s
port) to the network with equipment operating on the Data Link layer (for ex-
ample, network switch). In this case, generated test traffic should be rerouted
back to the analyzer via the loopback. At the DUT, source and destination
MAC addresses are swapped in the incoming packets, and the test stream is
retransmitted back to the source port on the analyzer.
All the connection schemes use the following notation:
•
MAC s — source MAC address;
•
MAC d — destination MAC address;
•
MAC R — gateway MAC address;
•
IP s — source IP address;
•
IP d — destination IP address.
The figure 5.6 shows analyzer connection to a network with equipment
operating on both the Data Link and Network layers (for example, switches
and routers). Unlike the first case, with this connection scheme both source
and destination MAC and IP addresses are swapped and the traffic is returned
to the source port.
In the case of testing networks/equipment with capability of IP-traffic
routing, two device ports are used (fig. 5.7). Packets are rerouted from one
port to another via a router. In addition,
Bercut-ET can be connected to a
network switch as shown on fig. 5.8.
Bercut-ET. Operations manual