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11.3.5 Ethernet Diagnostics
Non-intrusive Sniffing
E-DOC-CTC-20051017-0155 v1.0
For debugging purposes, the SpeedTouch™ offers a port mirroring feature. This
means that, three out of the four physical ethernet ports can be used for network
connections, while the remaining ethernet port can be used to connect a sniffing
device. In this way, when there is a network problem, a sniffer can be connected
without causing any intrusion in the network.
The first thing to do is to determine which ethernet port will be used for sniffing
purposes. In the example below ethernet port four will be used. Use the following
command to set port four as capturing port:
=>:eth switch mirror capture port=4
=>
To verify which port has been set as capture port, use the following command:
=>:eth switch mirror capture
Mirror capture port=4
=>
You can now set a port that you want to monitor to on the mirror capture port. This
can be done for egress traffic (packets leaving the modem) and ingress traffic
(packets towards the modem). In the example below we will monitor ingress traffic
on ethernet port one and egress traffic on ethernet port two. Use the following
commands:
=>:eth switch mirror ingress port=1 state=enabled
=>:eth switch mirror egress port=2 state=enabled:
All traffic comming in to the modem on ethernet port one will now be mirrored on
ethernet port four. All traffic leaving the modem on port two will also be mirrored
on ethernet port four. During port mirroring the capture port can still be used as a
normal ethernet port.
Chapter 11
SpeedTouch™ Advanced Diagnostics
189
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