Messages in this thread | | | Date | Wed, 24 Mar 2004 19:52:43 +0100 | From | Ignacy Gawedzki <> | Subject | IPv6 multicast in 2.4.25 broken? |
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Hi,
It seems that simple multicast support in IPv6 has ceased working starting at kernel version 2.4.25-pre4. More specifically, receiving multicast packets (those with destination address ff05::1 or ff02::1) is broken (read: sending is okay). The same binary run on kernels 2.4.24 and earlier works with no problem.
I tried as many combinations of USAGI patches and kernel versions as I could, but cannot figure the exact source of the problem. I did not inspect the diffs with enough attention, though.
Another funny thing is that the changelog for version 2.4.25-pre4 doesn't mention any change to IPv6 code.
Did anyone have similar experience and or suggestions?
I have not subscribed to the linux-kernel list, because of its high traffic, so please CC me the replies.
Thanks,
Ignacy
PS: The detailed way in which I prepare the socket is the following:
Open a UDP socket in IPv6 protocol family.
Bind it to network interface using SO_BINDTODEVICE.
Set the multicast network interface using IPV6_MULTICAST_IF.
Bind it to the network interface's address (which is set manually to fec0::1).
Set the multicast hops with IPV6_MULTICAST_HOPS to 1.
Set the multicast membership to ff02::1 (or ff05::1) using IPV6_ADD_MEMBERSHIP.
Unset the multicast loop using IPV6_MULTICAST_LOOP.
Note: the same socket is used to send and receive multicast packets.
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