id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
3247	Multicast join group does not honor interface specification	Dale Wilson <wilson@…>	chris_kohlhoff	"I'm working with the Multicast receiver example at:

http://www.boost.org/doc/libs/1_35_0/doc/html/boost_asio/example/multicast/receiver.cpp

Notice that you specify the listen_address as you create the endpoint that is bound to the socket. Later when you call socket::set_option with the multicast_address, I would expect the listen_address to be honored. The current implementation uses INET_ANY for the interface in the multicast subscription.   This means the multicast messages may arrive on one interface while you are listening for them on another one.  I can't think of any case in which you would want to specify an IP for the receive, but not for the join_group and it certainly shouldn't be the default behavior when you use the example code as a guide.

Workaround: There is a different constructor for the join_group object that does produce the desired behavior, but it is not obvious that you should need it.  Also it does not accept boost::asio::ip::addresses as arguments (which would make sense) but requires that you ""convert"" them to ip4 (or ip6) addresses.   Seems awkward.
"	Bugs	new	Boost 1.40.0	asio	Boost 1.39.0	Problem		multicast interface