[Boost-bugs] [Boost C++ Libraries] #3247: Multicast join group does not honor interface specification

Subject: [Boost-bugs] [Boost C++ Libraries] #3247: Multicast join group does not honor interface specification
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-07-06 21:18:46

#3247: Multicast join group does not honor interface specification
---------------------------------------------+------------------------------
 Reporter:  Dale Wilson <wilson@…>           |       Owner:  chris_kohlhoff
     Type:  Bugs                             |      Status:  new           
Milestone:  Boost 1.40.0                     |   Component:  asio          
  Version:  Boost 1.39.0                     |    Severity:  Problem       
 Keywords:  multicast interface              |  
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 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.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3247>
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