Evening all,
I made some investigation in my Ubuntu Linux , kernel 2.6.30
Here the case :
I have computer with 2 interfaces. It runs Ubuntu, kernel 2.6.30 and
application that opens multicast socket and bind it to one of the
interfaces, 192.168.123.1
There are only multicast packets in this net.
Multicast Packets with dest address 224.45.45.45 and source address
192.168.123.23 are received by
interface defined in the same network 192.168.123.0 with no problems
and even delivered to application.
But if I change the interface IP address to other network, these
packets are ignored at IP layer (data link layer got it since RX count
is running according to ifconfig )
I have tcp ip forwarding set to 1 and application sets multicast socket
option to join the multicast group.
I had an understanding that for multicast only destination MAC address
really rules ( interface filters are set to accept specific multicast
address as a result of muticats join by setsockopt() )
So the question is - why IP SRC address is taken into consideration
by IP layer and how to disable this feature ??
Thank you very much ..
Lev
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