Ssh -p22 "tcpdump -iem1 -s0 -U -n -w - not port 22 and port 25" > /tmp/remote To start capturing SMTP traffic you would use the following command from the management station Start capturing the traffic on the remote system, taking care to exclude the tunnel traffic with a tcpdump filter. It is also possible to use tshark or some other tool which is able to dump raw pcap data. Verify that tcpdump is installed on the remote system. Wireshark will open a capture window while it waits for traffic to appear in the pipe. Select the pipe as the local interface and start the capture in the normal way Select the pipes tab and click the New button.Įnter a name for the pipe then click the Browse button.īrowse to a suitable folder (/tmp) and enter a name for the capture file (remote). The fifo interface is added to Wireshark in the Manage Interfaces dialogue, which is accessed from the Capture Options dialogue. The fifo is added to the local interface list in Wireshark. In this case, raw pcap packets can be sent over an ssh tunnel and written to a 'fifo' file on the management station. Linux includes a number of tools for capturing network traffic from the console, however in many circumstances it is much more convenient to use the Wireshark GUI on a remote management station. Capture Traffic from headless Linux server with Wireshark on OSX
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