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I would like to send a stream from a Linux server to several Linux clients via a multicast address. The clients are directly connected to the server but on different interfaces: bnep0 and bnep1. Besides, as far as I understand, my multicast packets are routed to my default gateway eth0.

Routing table hereafter:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0
10.0.0.0        0.0.0.0         255.255.255.0   U     0      0        0 bnep1
10.0.1.0        0.0.0.0         255.255.255.0   U     0      0        0 bnep0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0

I suppose I need to create a dedicated routing rule, so that my multicast packets are sent not to eth0, but both to bnep0 and bnep1. My question is: how could I do that? I tried using ip route and iptables -t mangle ... TEE, but I didn't succeed.

Thanks in advance.

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The solution is not to implement routing rules in order to duplicate packages on the two interfaces, but to merge the interfaces into one.

For this, you have to create and use a network bridge. The bridge shall have a unique IP addresses, whereas the "real" interfaces shan't, even if they shall be up.

# apt-get install bridge-utils
# ifconfig bnep0 up
# ifconfig bnep1 up
# brctl addbr br0
# brctl addif br0 bnep0
# brctl addif br0 bnep1
# ifconfig br0 10.0.0.1 netmask 255.255.255.0

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