Announcing ethernet link state changes via route socket

[Sepherosa Ziehau]

On 3/16/07, Hasso Tepper <hasso at estpak.ee> wrote:
Announcing link state changes to the userspace via route socket is critical
to get routing related applications to work correctly - routing protocols
are most important, but other applications might benefit from it as well.
If there are no objections, I will commit this patch two days later.

Best Regards,
sephe
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