I am having issues with tcpdump in terminal

Question

I always end up with this error message, "tcpdump: ioctl(SIOCIFCREATE): Operation not permitted" Any ideas to what I am doing wrong. I am running this on OS X Yosemite.

Verbosity

You need to include code so we know what is causing the error, check here for some advice: stackoverflow.com/help/mcve – Mandrel

Answer 1

Any ideas to what I am doing wrong

Not running tcpdump as root. On Yosemite and later, tcpdump captures on the "any" device by default, and setting up an "any" device requires root privileges - not just the ability to open the BPF devices.

Gossipy

this is the answer, i.e. sudo tcpdump – Ineffaceable

Answer 2

Run sudo tcpdump.

You have to run it as a root because of macos security.

Formalin