Device: D-Link DIR-867 HW:A1 Software: openwrt-21.02.1-ramips-mt7621-dlink_dir-867-a1-squashfs-factory.bin
I only ever got this message with a timeout and zero bytes inbound:
udhcpc: sending discover
I tried these things:
The ISP is Teksavvy through a Technicolor DOCSIS modem. Any other DHCP client works as expected when directly connected to the modem. Reverting to stock D-Link firmware version 1.30 resolves the glitch.