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Asked: 2026-05-11T12:41:32+00:00

I’m working on a project that discovers/configures remote devices using UDP broadcasts. These devices

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I’m working on a project that discovers/configures remote devices using UDP broadcasts. These devices may not have IP addresses configured yet, at least no to match the network they are connected to. Currently we use a single sendto with a target address of 255.255.255.255. This works fine in most cases but on Vista machines with multiple NICs the broadcast only seems to be sent out one of the interfaces. How can I get Vista to send the broadcast to all interfaces?

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  1. I’ve personally never seen any system generate a packet for every interface in response to a single sendto call.

    A better option would be to enumerate the network interfaces, determine the correct link-local broadcast and send a separate packet individually via each interface.

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