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22a3fd2da9
When the link goes down, DHCP client_receive_message*() functions return an error and the related I/O source is removed from the main loop. With the current implementation of systemd-networkd this doesn't matter because the DHCP client is always stopped on carrier down and restarted on carrier up. However it seems wrong to have the DHCP client crippled (because no packet can be received anymore) once the link goes temporarily down. Change the receive functions to ignore a ENETDOWN event so that the client will be able to receive packets again after the link comes back.
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