Asus RT-AC58U OpenWrt not working with Gigabit/1000base T speeds

Installing and Using OpenWrt
1

So I've followed the instructions from the 58u page and have successfully installed 19.07.2 version of the openwrt release.

The main reason I moved to OpenWrt is that the stock firmware was buggy with negotiating 1 Gbps connection with my ISP.

After installing openwrt this still doesn't seem to work. I'm stuck with a 100 Mbit connection link.

This is the output from ethtool eth1. Setting is to 1000 speed doesn't work and it just goes to Link detected : no


Settings for eth1:
        Supported ports: [ ]
        Supported link modes:   Not reported
        Supported pause frame use: No
        Supports auto-negotiation: No
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Full
        Link partner advertised pause frame use: No
        Link partner advertised auto-negotiation: No
        Link partner advertised FEC modes: Not reported
        Speed: Unknown!
        Duplex: Unknown! (255)
        Port: Twisted Pair
        PHYAD: 4
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000000 (0)

        Link detected: no
2

fwiw, have you considered you may have faulty hardware (modem or router)?

As a test, perhaps install a gigabit switch between the ISP modem and the Asus and see what speeds are negotiated on the switch ports?

3

And most of all, check the cables (by temporarily replacing them).

4

Yeah. I thought it could be a hardware issue but the thing is Gigabit link was working initially on stock. A couple of days ago there was a power outage in my area and then it stopped working after that.

Confusingly, disabling the NAT acceleration bought it back to 1 Gbps link but yesterday again, randomly it was gone.

This is what pushed me to OpenWRT thinking it could be a firmware issue.

5

Yeah. I thought it could be a hardware issue but the thing is Gigabit link was working initially on stock. A couple of days ago there was a power outage in my area and then it stopped working after that.

Confusingly, disabling the NAT acceleration bought it back to 1 Gbps link but yesterday again, randomly it was gone.

This is what pushed me to OpenWRT thinking it could be a firmware issue.