![]() Plain passwords on the command line are a security risk. $ ssh "echo | sudo -S tcpdump -U -s0 not port 22" -i eth0 -w - | sudo wireshark -k -i. You can check and find the proper one via $ ip link. You can inspect the headers of TCP/IP packets easily with tcpdump. TCPDump is released under the BSD license. ![]() This tool comes pre-installed on all Unix-like operating systems. ![]() It can be thought of as the commandline version of wireshark (only to a certain extent, since wireshark is much more powerful and capable). TCPDump is an open-source and powerful command-line packet analyzer tool that captures protocols such as TCP, UDP, and ICMP (Internet Control Message Protocol). It depends on its type and count off different interfaces. Tcpdump Tcpdump is a commandline network analyzer tool or more technically a packet sniffer. And the network interface (eth0) in not necessarily eth0. Port is automatically chosen by protocol specification, so not necessarily required. networksetup -listallhardwareports Then, run a packet trace on that interface. This will list all your network interfaces. Step one is figure out what network interface you want to dump. Replace content in angle brackets to your needs. tcpdump comes on OSX (or if it doesn’t, something installed it without me knowing). This enables root privileges for tcpdump on the host to be sniffed remotely. If you have no root access via ssh on your host being sniffed to, like on a raspberrypi, and for good reason you don't want to enable it or you simply can't do it, for whatever reason, there is a slightly different approach of (alternative to answer to that from we do here is to pipe the sudo password into the sudo command which executes its argument tcpdump.
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