From: David Ward <david.w...@ll.mit.edu>
Date: Sun, 26 Jul 2015 12:18:58 -0400

> This notification causes the FIB to be updated, which is not needed
> because the address already exists, and more importantly it may undo
> intentional changes that were made to the FIB after the address was
> originally added. (As a point of comparison, when an address becomes
> deprecated because its preferred lifetime expired, a notification on
> this chain is not generated.)
> 
> The motivation for this commit is fixing an incompatibility between
> DHCP clients which set and update the address lifetime according to
> the lease, and a commercial VPN client which replaces kernel routes
> in a way that outbound traffic is sent only through the tunnel (and
> disconnects if any further route changes are detected via netlink).
> 
> Signed-off-by: David Ward <david.w...@ll.mit.edu>

Yeah, this makes sense, applied.

I bet the SCTP notifier could have ended up with dups in it's local
address list because of this.
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