Guys,

I have a application running on Linux using boost 1.35, that receives packets to several different multicast addresses, but on the same port and interface. For each different multicast address I perform the following:

// create a new socket

socket_(ioService)

// set the listen end point to that of the multicast address and port

boost::asio::ip::udp::endpoint listenEndPoint(multicastAddress.to_v4(), port);

// we need to be able to reuse the underlyling socket created as more than one asio socket will share it.

socket_.set_option(boost::asio::ip::udp::socket::reuse_address(true));

socket_.bind(listenEndPoint);

// perform the actual join to the multicast group

socket_.set_option(boost::asio::ip::multicast::join_group(destAddress.to_v4(), interfaceAddress.to_v4()));

So I bind to a seperate asio socket instance for each multicast address and then perform a join to that address, hence each asio socket only has a single join associated with it.

Is a better approach to have a single asio socket instance and perform a join for each multicast address that shares the port & interface? If so, how would I set listenEndPoint? Is there any performance differences between the two? Are there better approaches?

Thanks.

Lee MacDonald

Schneider Trading
4th Floor,
25 Copthall Avenue
London EC2R 7BP

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