Hello- A number of us are working on an OSS overlay network system called flannel. It is used in a variety of Linux container systems and one of the backends is VXLAN.
The issue we have: when creating the VXLAN interface and assigning it an address we see a broadcast route being added by the Kernel. For example if we have 10.4.0.0/16 a broadcast route to 10.4.0.0 is created. This route is unwanted because we assign 10.4.0.0 to one of our VXLAN interfaces. However, the Kernel interface bring-up comment reads: Add network specific broadcasts, when it takes a sense. The code is here: https://github.com/torvalds/linux/blob/master/net/ipv4/fib_frontend.c#L859-L872 Can someone explain why creation of the broadcast route is non-optional? Would a patch to make it optional be acceptable? Is it safe for us to simply delete the route? We have a patch that simply deletes the broadcast route after interface creation but don't know why the Kernel code "makes sense". You can read more information about the issue here: https://github.com/coreos/flannel/pull/569 Thank You, Brandon
