Making ethtool changes permanent...

[Lee Harris_5]

When changing LAN interface settings using ethtool for example like when manually setting a NIC to run at 100Mbps/Full Duplex, are these changes persistent across reboots, or will the card go back to the default of using AutoNeg after the server is rebooted?

If this is the case, how can I go about making these type of configuration changes permananet?

[Vipulinux]

Hi

You can either write the eth-tool config lines to /etc/rc.local

or
there are other option like editing the modules.conf file and ifeth0-up file as well.

Cheers

[Sergejs Svitnevs]

for Redhat you can put "ethtool -s eth0 speed 100 duplex full" into the "/etc/rc.local" file.

for Debian add next string into the "/etc/network/interfaces" file:
"post-up ethtool -s eth0 speed 100 duplex full".

This will set the NIC at eth0 to 100 full duplex when you boot up the server.

Regards,
Sergejs

[Vitaly Karasik_1 · Accepted solution]

In RH Linux you can just add

ETHTOOL_OPTS="speed 100 duplex full autoneg off"

into

/etc/sysconfig/network-scripts/ifcfg-eth[0,1]

But if you know what is NIC module params for setting duplex/speed, /etc/modules.conf is the best place for tuning!

[Lee Harris_5]

Thanks, putting the options into /etc/sysconfig/network-scripts/ifcfg-ethX worked perfectly!