Something on your computer is telling calibre that the 167.20 IP address is what it should use. What that is, I cat say. I don't own and never use macs, so I don't know enough to give hints.
You can tell the wireless device plugin which interface to listen on by going to preferences / plugins / device interface plugins / smart device then pushing the configure plugin button.
Also make sure that you do not have any virtual private networks (VPNs) configured. They can confuse network interface selection because they appear to be valid networks but they are not.
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