Disable Ethernet auto-negotiation at startup

Technical Support
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1

Hi,

I can desactivate autonegocation after startup with this command :
ethtool -s eth0 speed 100 duplex full autoneg off

But I want to disable on startup.
How can I do that?

2

hi @mazareth

You can create and launch a service at the startup as explained here.

Best regards, Jaski

3

hi @jaski.tx
I know how to add a service.
But i think the autonegociation was done by one of your services and i don’t know which one.

If i put a service after, the autonegociation should be already done. No?

4

Hi,
To be more explicit,

Where can i find the ETHTOOL_OPTS parameter in the linux filesystem?

If i put these parameters that could be great ”autoneg off speed 100 duplex full”

edit :
maybe the file
root@apalis-imx6:/etc/network/if-up.d# cat zeroconf

could do something?

5

Yeah, but the service will turn the autoneg off before the module get an IP Address. So what is the issue?

6

Where can I find the ETHTOOL_OPTS parameter in the linux filesystem?
I didn’t see this in the linux kernel configuration. So I don’t know, where you can find it.

edit : maybe the file root@apalis-imx6:/etc/network/if-up.d# cat zeroconf
I don’t think this is possible.

could do something?
The only solution I know is to use ethtool with the command you provided.

Best regards, Jaski

7

My solution if someone need it :

add a service

[Unit]
 Description=/etc/rc.local Compatibility
 ConditionPathExists=/etc/rc.local

[Service]
 Type=forking
 ExecStart=/etc/rc.local start
 TimeoutSec=0
 StandardOutput=tty
 RemainAfterExit=yes
 SysVStartPriority=99

[Install]
 WantedBy=multi-user.target

And add the rc.local file

#! /bin/sh
ethtool -s eth0 speed 100 duplex full autoneg off
exit 0
8

Thanks for the Input. Perfect that you found a solution.