I am trying to use a workstation with Wireshark on it to capture the traffic to/from another workstation on the network. The goal is to view all traffic that takes place to this one machine during network imaging.
So I set up the SPAN session on the Cisco WS-3750-48P [12.2(55)SE7]. Fairly simple.
monitor session 1 source interface fastEthernet1/0/1 (workstation we are imaging)
monitor session 1 destination interface fastEthernet1/0/2 (workstation with Wireshark)
I ensure the SPAN session on the switch (show monitor session 1 detail). I also ensure that the monitoring machine is plugged into the correct port (f1/0/2).
I fire up Wireshark, choose the NIC, ensure 'promiscuous mode' and then start the capture. The machine is a Dell Optiplex 760 running Windows 7 Enterprise. NIC: Intel 82567LM-3 Gigabit
Then we start the PXE boot and the target machine is off & running; imaging as normal.
Nothing but a handful of local (my machine) ARPs and a few UDP lines in the Wireshark window. I see nothing to/from the other machine (the mirrored port).
Any thoughts on why Wireshark is not picking up this traffic? Where can I start trouble-shooting. I have been trying to get to the Wireshark pages but that's a no-go as of right now. I cannot give any screen shots of this.
VPN & other software utilities can interfere with the TCP/IP stack on your machine and result in Wireshark not capturing the traffic properly. I experienced this when Checkpoint VPN software was loaded on the m/c I was using ... as soon as it was disabled, Wireshark captured all traffic. Something to look into.
I had the same problem. I could see from the switch interface statistics that the data was being forwarded and the raw bytes received count on my laptop's NIC was going up, but Wireshark was only showing a small fraction of the traffic. Turned out Symantec's Network Threat Protection was filtering out all the data. I turned off Symantec and was immediately flooded with the traffic I was looking for. Hopefully it is that simple for OP.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...