With GNS3 you actally can capture traffic sent between emulated devices. Packets are saved on a capture file which can be opened with Wireshark or anyother packet analyzer.The downside is that the packet capturing activity doesnt looks real-time. You need to refresh (CTRL+R) to view the latest capture. WIndows users can install tail (http://tailforwin32.sourceforge.net) to get a near real-time view of the capture.
1. Install Wireshark from www.wireshark.org
2. Configure Path and working directory
3. Open GNS3 lab and right click on the link on which you want to capture packet and choose the interface
This will start wireshark and the capture will be displayed.Also a capture output file will be created on the working you have selected in GNS3 preference. For viewing real time capture use CTRL+R or configure "tail"
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