Default Network config disables 2 NICs

I have a Linksys Wireless Router with 4 LAN ports and 1 WAN ports, I installed OpenWRT on it pretty much with default network configuration, except enabled WiFi and PPPoE over WAN.
However,I found that 2 NICs (LAN1 and LAN3) were disabled (OpenWRT web admin shows "no link"), Plugin cable did not turn on the light of RJ45 port. But LAN 2 & LAN 4 were working as expected..

Any thoughts please ?

please post the output of

ubus call system board
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Did you use the same cable (and device at the other end) to test all the ports? Were the ports working immediately before you flashed OpenWRT onto the router?

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same network cable...

root@OpenWrt:~# ubus call system board
        "kernel": "5.15.150",
        "hostname": "OpenWrt",
        "system": "ARMv7 Processor rev 1 (v7l)",
        "model": "Linksys WRT1200AC",
        "board_name": "linksys,wrt1200ac",
        "rootfs_type": "squashfs",
        "release": {
                "distribution": "OpenWrt",
                "version": "23.05.3",
                "revision": "r23809-234f1a2efa",
                "target": "mvebu/cortexa9",
                "description": "OpenWrt 23.05.3 r23809-234f1a2efa"

Are you sure those ports worked with the original firmware? Unless you changed the configuration, only reason I can think for that behavior is a hardware issue, but that should happen with the original firmware too.


At least port LAN 1 was working fine few months ago in Linksys's original firmware. After I installed OpenWRT, the issue came out. I tend to believe that HW Port is not faulty, though there is still a chance for that.

Try restoring the vendor firmware to see if the ports start working again. That is really the only way to truly rule in/out a hardware failure (or other related issue).


will do the testing to confirm.. thanks for your reply.

Let us know what happens.

If it's not too late, please post the output of the following:

cat /etc/config/network

I was looking at your screenshot and something seemed very wrong, but I'm not sure what the config file actually shows -- that's the way to know for sure.