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Date:   Fri, 9 Dec 2016 16:07:52 -0800
From:   Brandon Philips <>
To:, Tom Denham <>,
        Aaron Levy <>,
        Brad Ison <>
Subject: fib_frontend: Add network specific broadcasts, when it takes a sense


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

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 a broadcast route to is created. This route is
unwanted because we assign 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:

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

You can read more information about the issue here:

Thank You,


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