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How to renew a client DHCP address with an OpenWrt router, from its SSH terminal session?

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Done the research and answering to the future me. OpenWrt uses udhcpc as its DHCP client (rather than dhclient). To renew DHCP leases on all interfaces, the following one-liner can be used (thanks to the source):

PID=`pidof udhcpc` && kill -SIGUSR1 $PID
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