I plan to use nmcli for it needed NetworkManager.
journalctl -u ifup@eth0.service:
-- Journal begins at Mon 2022-12-12 19:57:07 GMT, ends at Mon 2022-12-12 21:17:01 GMT. --
Dec 12 19:57:09 DietPi systemd[1]: Starting ifup for eth0...
Dec 12 19:57:10 DietPi dhclient[459]: Internet Systems Consortium DHCP Client 4.4.1
Dec 12 19:57:10 DietPi ifup[459]: Internet Systems Consortium DHCP Client 4.4.1
Dec 12 19:57:10 DietPi ifup[459]: Copyright 2004-2018 Internet Systems Consortium.
Dec 12 19:57:10 DietPi ifup[459]: All rights reserved.
Dec 12 19:57:10 DietPi ifup[459]: For info, please visit https://www.isc.org/software/dhcp/
Dec 12 19:57:10 DietPi dhclient[459]: Copyright 2004-2018 Internet Systems Consortium.
Dec 12 19:57:10 DietPi dhclient[459]: All rights reserved.
Dec 12 19:57:10 DietPi dhclient[459]: For info, please visit https://www.isc.org/software/dhcp/
Dec 12 19:57:10 DietPi dhclient[459]:
Dec 12 19:57:10 DietPi dhclient[459]: Listening on LPF/eth0/f6:a5:ed:fd:ae:23
Dec 12 19:57:10 DietPi dhclient[459]: Sending on LPF/eth0/f6:a5:ed:fd:ae:23
Dec 12 19:57:10 DietPi ifup[459]: Listening on LPF/eth0/f6:a5:ed:fd:ae:23
Dec 12 19:57:10 DietPi ifup[459]: Sending on LPF/eth0/f6:a5:ed:fd:ae:23
Dec 12 19:57:10 DietPi ifup[459]: Sending on Socket/fallback
Dec 12 19:57:10 DietPi ifup[459]: DHCPREQUEST for 192.168.31.238 on eth0 to 255.255.255.255 port 67
Dec 12 19:57:10 DietPi dhclient[459]: Sending on Socket/fallback
Dec 12 19:57:10 DietPi dhclient[459]: DHCPREQUEST for 192.168.31.238 on eth0 to 255.255.255.255 port 67
Dec 12 19:57:14 DietPi dhclient[459]: DHCPREQUEST for 192.168.31.238 on eth0 to 255.255.255.255 port 67
Dec 12 19:57:14 DietPi ifup[459]: DHCPREQUEST for 192.168.31.238 on eth0 to 255.255.255.255 port 67
Dec 12 19:57:19 DietPi dhclient[459]: DHCPREQUEST for 192.168.31.238 on eth0 to 255.255.255.255 port 67
Dec 12 19:57:19 DietPi ifup[459]: DHCPREQUEST for 192.168.31.238 on eth0 to 255.255.255.255 port 67
Dec 12 19:57:19 DietPi dhclient[459]: DHCPACK of 192.168.31.238 from 192.168.31.1
Dec 12 19:57:19 DietPi ifup[459]: DHCPACK of 192.168.31.238 from 192.168.31.1
Dec 12 19:57:20 DietPi dhclient[459]: bound to 192.168.31.238 -- renewal in 18514 seconds.
Dec 12 19:57:20 DietPi ifup[459]: bound to 192.168.31.238 -- renewal in 18514 seconds.
Dec 12 19:57:20 DietPi systemd[1]: Finished ifup for eth0.
HA Supervised not installed.