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5b0d9338fd
When LWIP_HAVE_LOOPIF is enabled, a separate loopback interface is added as a netif. A netif need to have its link state set to up to be able to be selected as a route in ip4_route or ip6_route. The regression appears to be when bug #43904 (ip_route() and ip6_route() must detect linkup status) was fixed. Furthermore, there is no point of having the loopif down by default.