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This is set nonzero when there is a scope identifier at the end of an IPv6 address, like fe80::a8bb:ccff:fedd:eeff%eth0. When this happens, we add an rtattr with type RTA_OIF to request a particular outgoing interface. In my tests, this does the right thing when the address is in fact the assigned address of the interface; the interface becomes lo instead of the physical interface name.