I'm searching for a equivalent of "iwconfig eth0 mode Monitor" in Mac OS.
From man iwconfig mode Monitor does the following:
"the node is not associated with any cell and passively monitor all packets on the frequency"
What you're looking for is
Example of sniffing in monitor mode:
This sniffs on channel 1 and saves a pcap capture file to
To search for active channels nearby that you can sniff, run this:
Although you can capture any traffic, you can only effectively read if the network is open or you have the encryption key.
by default on OSX en0 is your ethernet port, while en1 is your airport