Firehose is a program for forwarding multicast traffic, converting multicast traffic to unicast, or unicast to multicast.

Its full operation involves running it on two different subnets, one to capture multicast traffic and forward it as unicast to another instance, which multicasts it to the destination network.

make

There's also a sample multicast sender program called sender:

make sender

The first is considered the forwarder (fwd), the second is considered the receiver (recv):

Usage:
./firehose [options] fwd 'mcaddr:port' 'src:port' 'unidst:port' ['mc_local_if_addr:ignored']
./firehose [options] recv 'recvaddr:port' 'multidest:port' 'srcaddr:port'

options:
-v --verbose Verbose output (log each packet)

The address parameters are generally in traffic order:

fwd addresses:

• mcaddr:port the address to subscribe to

• src:port the source address to send unicast traffic from

• unidst:port the unicast destination (receiver address)

• mc_local_if_addr:ignored (optional) address to bind for receiving multicast traffic (port value unused)

recv addresses:

• recvaddr:port Unicast address to receive on (should match fwd's unidst:port)

• multidest:port Multicast group address to send to

• srcaddr:port Address to send multicast traffic from