Hado, you can use IP_BOUND_IF to bind socket to the particular interface index. something like int idx = if_nametoindex( "en1"); setsockopt(s, IPPROTO_TCP, IP_BOUND_IF, &idx, sizeof(idx) ); -- Sincerely, Rustam Muginov On Jan 4, 2014, at 12:43 PM, Hado Hein <maclists@batchmaker.de> wrote:

I’m trying to find a solution to send udp broadcasts over a specific network interface. Binding to an address is not an option.

Since so_bindtodevice is not available on Darwin I’m looking for an alternative. I have two ethernet interfaces which both go to different class c subnets. The first interface has also a gateway set (Internet).

Now I need to send a broadcast to a class a device physically on the second ethernet port. Neither of these (interface nor class a device) can change their ip or their subnet.

Is there a possibility to achieve this at userlevel?

thx,

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