How can you choose the network interface via which UDP broadcast packet is sent?

Generally speaking, if you socket.bind() to an address (such as 127.0.0.1 ) then your packets should originate from that address. The loopback, and broadcasts for that matter, might be treated specially but bind() would be my first choice to try.

I guess you're trying to send it out to the loopback device, so it should be something like (never tried this with ruby).

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