LAN connection fails: ip-configuration-unavailable

Installing and Using OpenWrt
1

Hello,

I bought an openwrt one as a way to force myself to learn some networking. So apologies for beginner questions or misunderstandings. The LAN connection isn't working so I can't even get into luci. I did a little bit of AI supported troubleshooting and learned some stuff. The AI's summary will be better than mine:

Troubleshooting summary (OpenWrt One, fresh device):

  • Laptop: Manjaro KDE (Lenovo IdeaPad Slim 3), RTL8153 USB Ethernet
  • Topology: Laptop → LAN port, modem → WAN (also tested with modem disconnected)

Layer 1 (Physical):

  • Link up (UP, LOWER_UP )
  • LEDs active on both ends
  • Cable + adapter confirmed working

Layer 2 (Data Link):

  • No ARP response from 192.168.1.1
  • No MAC learned for router on interface

Layer 3 (Network):

  • DHCP fails (ip-configuration-unavailable )
  • Manual IP set (192.168.1.2) → no connectivity
  • Ping to 192.168.1.1 fails

Conclusion:

  • Link established, but no L2/L3 response from router LAN
  • Suspecting router boot/config issue or faulty unit

Thank you for any help you can provide!

2

Which port on the OpenWrt One are you using to connect your computer? The PoE port is (by default) setup as the wan, so it should be the other one. Please confirm (and if you're using the PoE port, try the other and let us know if that helps).

The DHCP server should be active by default on the lan, but it is possible that it is not running if the lan port was connected to a device/network that has a DHCP server active already. Therefore, the best bet is to unplug the power and disconnect any upstream connections. Then connect your laptop to the One and connect power.

Did you make any changes to the config, or is this fresh out of the box?

3

Thanks for the very quick reply, and with appropriate embarrassment I can confirm that I plugged it in wrong.

Appreciate the help!

4

Glad that the solution was simple.

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Thanks! :slight_smile: