Ethtool lan1 on Linksys E8450


I'm experiencing performance issues on Linksys E8450 as posted here.

I've since then, discovered that my LAN port 1 is running at 100Mbps instead of 1Gbps (Running the command ethtool lan1) on the Linksys E8450.

I tried to fix it using "ethtool -s lan1 speed 1000 duplex full autoneg on" but it hung instead.
Can someone run "ethtool lan1" and see what your speed is?

Mine says the following.

ethtool lan1

Settings for lan1:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/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
        Link partner advertised pause frame use: Symmetric Receive-only
        Link partner advertised auto-negotiation: Yes
        Link partner advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: d
        Wake-on: d
        Link detected: yes

You could have continued on your original post since it is pretty much the same fault.

But no where in either post you never mention the status of the actual ethernet cable you use in the port?
What class of cable do you use and is it broken?

Is the same fault in every port?

Is the fault present also after a system reset to standard settings?

What speed does a computer get if you connect it to a port?

I'm using a CAT 5e cable.

I've inspected the cable, and the only thing broken about it is that the tail/holder is broken. (see the part pointed to by the red arrow)

The highest speed I can get is between 70-90 Mbps which seems to lead me to the impression that some setting or the cable is limiting it to below 100 Mbps. On a previous router (Linksys WRT1900AC), I was able to get about 250Mbps using this same cable.

If I use a CAT 7 cable on the same port, but connected to a laptop, the ethtool reading is 1000 Mbps, not 100Mbps.

The device at the other end of the cable --the link partner-- is not advertising itself as GbE capable. Is it even GbE hardware?

So you're only going to have a 100 Mb connection.

1 Like

Yes it is GbE capable. I was previously using the same cable, with WRT1900AC, and using the same cable, I was able to achieve around 250Mbps in both directions.

Also, Windows claims

In either "auto negotiation", or setting to "1 Gbps" on the driver on Windows, it was able to communicate.