Set NIC speed to full duplex permanent in 12.04 LTS

[QKC]

Dear Ubuntu Member
I am running 12.04 LTS on a pentium system. My network speed is at the moment Auto Negotiation. I have use the ethtool to turn off auto negotiation on my NIC and using the command sudo ethtool -s eth0 speed 100 duplex full to set my NIC to 100mps full duplex. But each time after rebooting the system, my NIC will revert back to Auto Negotiation. Is there any way to have the setting permanent in 12.04 LTS?

Appreciate all helpers
Thanks
JQ

[chili555]

Please open a terminal and do:
gksudo gedit /etc/rc.localAdd a new line above exit 0:
ethtool -s eth0 speed 100 duplex fullProofread carefully, save and close gedit. You should be all set.

[QKC]

Hi chili555,
Thank you very much for your help. My 12.04 LTS now is a little faster. :). Do you mind to help me out on another system that is install with Linux Mint 14 64 bit edition as I cannot get the NIC to set 100mps full duplex on permanent

JQ

[chili555]

Hi chili555,
Thank you very much for your help. My 12.04 LTS now is a little faster. :). Do you mind to help me out on another system that is install with Linux Mint 14 64 bit edition as I cannot get the NIC to set 100mps full duplex on permanent

JQI believe Mint is Ubuntu based and the same technique should work. Did you try it?

[QKC]

Hi
I have tried it but it doesn't seem to work. Below is the outputs of my try

asus@ASUS ~ $ sudo ethtool eth0
[sudo] password for asus:
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 100baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yes
asus@ASUS ~ $ gksudo gedit /etc/rc.local

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
ethtool -s eth0 speed 100 duplex full
exit 0

I have also attach my NIC details. Can you please help to see which part I make a mistake

Thanks

[chili555]

asus@ASUS ~ $ sudo ethtool eth0
[sudo] password for asus:
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 100baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yesAnd in /etc/rc.local, you asked for:
ethtool -s eth0 speed 100 duplex fullWhat part seems not to have worked?

[QKC]

Hi
See the red part


asus@ASUS ~ $ sudo ethtool -s eth0 autoneg off
[sudo] password for asus:
asus@ASUS ~ $ sudo ethtool -s eth0 speed 100 duplex full
asus@ASUS ~ $ sudo ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: 100Mb/s
Duplex: Full
Port: MII
- This PHYAD: 0
Transceiver: internal
Auto-negotiation: off <---------------is the part that is having problem.
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yes
asus@ASUS ~ $

After adding ethtool -s eth0 speed 100 duplex full to /etc/rc.local, after a restart the Auto Negotiation should be Off and should be permanent but each time after restart I will have to do this ethtool -s eth0 speed 100 duplex full again to turn off

Thanks

[chili555]

Your original inquiry didn't mention autonegotiation. However, I suggest that you amend the /etc/rc.local setting to:
ethtool -s eth0 speed 100 duplex full autoneg offTurning off autonegotiation is a bit dangerous because you may be demanding that the router and NIC card perform at levels for which they are incapable. If it doesn't always work as expected or you get errors or dropped packets, you know how to undo it.

[QKC]

Hi chili555
Update on the problem.
After inserting ethtool -s eth0 speed 100 duplex full autoneg off in the /etc/rc.local settings, I experience as what you inform, my internet connection speed drop. Then I insert back ethtool -s eth0 speed 100 duplex full and my internet connection speed went back to normal.

Thank you for help.

[chili555]

So you are all set? Glad it's working.

[QKC]

Hi chili555
Yeah. All back to normal. Thanks:lolflag: