From: Ivo Wever <wever@...>
Date: 2012-02-03T19:36:46+09:00
Subject: Choosing target network for UDP broadcast

If I send a UDP packet containing 'foo' like this:

  socket = UDPSocket.new
  socket.setsockopt(Socket::SOL_SOCKET, Socket::SO_BROADCAST, true)
  socket.send('foo', 0, '<broadcast>', 40001)

then wireshark tells me it gets sent from 192.168.x.y. However, my
server is listening on localhost:40001. How can I choose the source
address from which (and the interface via which) the socket will send
its packet?

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