[boost] [asio] Multiple Interface Multicast Receive Error

From: dhk24_at_[hidden]
Date: 2007-04-23 12:51:20

I am trying to get a dual homed computer working receiving multicast
messages using ASIO and there appears to be all kinds of problems.

Firstly, when trying to receive multicast traffic ASIO will only ever
bind to one address. Even explicitly providing an IP address to bind to
will not convince the OS to allow you to bind to that address. In my
case it always attempts to bind to the device that is connected to the
WAN.

Secondly, even if both devices are connected to the same network, ASIO
will only receive multicast packets on one interface. If that interface
is disconnected it will no longer receive multicast packets.  I have
tested this using both the any address and with explicit IP addresses
over multiple sockets. Neither seem to work.

Disabling all interfaces except the one receiving Multicast traffic
allows ASIO to bind to the last remaining interface and receive packets
properly.

I have seen this problem using ASIO 0.3.7 and both my own programs and
the default multicast receive included with ASIO. I have also been able
to replicate it using Windows XP SP2 and Fedora Core 6 ( 2.6.20-1)

Any explanation or help would be greatly appreciated

Dan