After updating the kernel on a KVM host, I discovered yesterday that I can no longer use more than one vxlan interface on a single multicast group/address. The interfaces can be created but only the first one may be brought up:
# ip link add vx100 type vxlan id 100 group 239.0.0.1 dev eth0 # ip link add vx200 type vxlan id 200 group 239.0.0.1 dev eth0 # ip link set up dev vx100 # ip link set up dev vx200 RTNETLINK answers: Address already in use Using unique group addresses (one VNI per group) still works as expected. The problem is not present in kernel 4.0.5 but it is in kernel 4.1.0. I suspect (but have not verified) that the regression was caused by this commit: vxlan: Move socket initialization to within rtnl scope 56ef9c909b40483d2c8cb63fcbf83865f162d5ec https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/net/vxlan.c?id=56ef9c909b40483d2c8cb63fcbf83865f162d5ec I am working to verify that that is the culprit but I thought I’d see in the mean time if anyone else has encountered and/or fixed this, or can at least shed more light on the problem. Thanks! JN -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
