ZyXEL Communications ES 3500 Series Troubleshooting Manual page 125

If the switch has a virtual IP address for the client with issue's network, proceed to
step 12.
If the switch does not have a virtual IP address for the client with issue's network, go
to step 14.
Mirror and capture the traffic of client with issue.
Access the switch directly connected to client with issue and mirror ingress and
egress traffic on that port. Afterwards, have the client with issue ping the virtual IP
address.
Using Web GUI:
Figure 16 Advance Application > Mirroring
In this example, PC running Wireshark is connected to port 10 of this switch
while client with issue is directly connected to port 1.
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