bind carrier status to underlying eth0 port, so up on boot #3980
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Description
It seems like, with no other network service to bring them up (networking, NetworkManager), systemd-networkd will not set "up" the wan and lan0/lan1 interfaces. To fix this, the default systemd.network files get the line "BindCarrier=eth0" to bring those three interfaces up with the mii port.
This should make no change for most users.