Comments on: Linux add ethtool duplex settings to a network card permanently

By: Peter

Peter — Tue, 10 Jan 2012 14:34:53 +0000

Added ETHTOOL_OPTS=”speed 1000 duplex full autoneg off” to ifcfg-eth1 to force gigabit. After a restart I get these messages. What’s wrong with eth1 (Realtek RTL-8169), working fine on 100 Mbs though…?

# etc/init.d/network restart
Shutting down interface eth1: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0:
Determining IP information for eth0… failed; no link present. Check cable?
[FAILED]
Bringing up interface eth1: Cannot get current device settings: Operation not supported
not setting speed
not setting duplex
not setting autoneg

By: Seb176

Seb176 — Thu, 15 Dec 2011 11:21:14 +0000

Thank you!!
Very usefull for my old laptop!

By: Dhileesh

Dhileesh — Mon, 21 Mar 2011 13:31:50 +0000

Good option

By: dotpointer

dotpointer — Mon, 14 Mar 2011 18:49:06 +0000

(All above is run as administrator -do ‘sudo passwd root’ to set your password, then ‘su’)

Another notice, if you already have done the above tip with /etc/init.d/, here is how to remove that:

rm /etc/init.d/100mbit
update-rc.d 100mbit remove (notice the actual file removal must be done before)

By: dotpointer

dotpointer — Mon, 14 Mar 2011 18:43:35 +0000

Ubuntu 10.10, a Marvell Gigabit Ethernet and gigabit 1000mbit speed:

– Manual change while working on it:
ethtool -s eth0 speed 1000 duplex full autoneg off

– Hopefully permanent – /etc/network/interfaces:
auto lo
iface lo inet loopback
iface eth0 inet dhcp
pre-up /sbin/ethtool -s $IFACE speed 1000 duplex full autoneg off

– Testing the file (NOTICE: ifconfig eth0 down/up does NOT test the file):
ifdown eth0
ifup eth0

By: Gogule

Gogule — Thu, 03 Mar 2011 22:29:47 +0000

on centos 5.4 final this command work
mii-tool -F 100baseTx-FD

thk for help

By: FishMaster3000

FishMaster3000 — Wed, 19 Jan 2011 23:12:08 +0000

Thanks for the tip. I applied it to my hardware and I am happy that the speed it blazing in my VM. I will keep watch on whether the ethernet card drops the connection as it has been doing in the past. If it remands up, I am extremely happy.

(AMD Phenom II X4 940, 8G memory, 2 gig ethernet, 3 Tb of harddrive, nvidia cards)

By: arunmanoj

arunmanoj — Wed, 22 Dec 2010 05:57:48 +0000

could pls tel ,how to set the speed to 10mbps full duplex, i tried ur above script & steps (with 10 instead of 100),but its not working..

OS : Ubuntu 10.4 LTS

Thanx in advance

By: Tiago MDRizzo

Tiago MDRizzo — Tue, 27 Jul 2010 13:35:33 +0000

For Debian, like Rafael Guedes said, isn’t it easier to append in /etc/network/interfaces?

Not just it, but you can add routes and delete them too using post-up and post-down option in Debian… I never tested in Ubuntu though…

By the way, Cyberciti is my favorite site :D

Regards from Brazil!!

By: Rafael Guedes

Rafael Guedes — Fri, 04 Jun 2010 03:06:01 +0000

Hi, nice post! For Debian, I think that you just need append the follow line at /etc/network/interfaces file:

post-up ethtool -s eth0 speed 10 duplex half

I tested it , and for me it works very well. Regards from Brazil.

By: Sergio Luiz Araujo Silva

Sergio Luiz Araujo Silva — Mon, 17 May 2010 18:07:50 +0000

if device is eth1 generate error, to solve:

DEV=`netstat -i | awk ‘/eth/ {print $1}’`

By: Jordan

Jordan — Thu, 01 Oct 2009 22:26:05 +0000

What do I need to add to the Debian script to turn autonegot off?

By: Prachi

Prachi — Wed, 02 Sep 2009 07:48:51 +0000

Hi,

I have 2 ethernets (eth0 and eth1) with bouding done as bond0.

# ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: g
Current message level: 0x000000ff (255)
Link detected: yes

# ethtool eth1
Settings for eth1:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: g
Current message level: 0x000000ff (255)
Link detected: yes

[root@amuswatnas01 ~]# ethtool bond0
Settings for bond0:
No data available

I want to hard-code the speed to 1000 MBps Full duplex, how can I do that on bouded network,
Do I need to simply edit ifcfg-eth0 and ifcfg-eth1 file with following entries.
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
Append following line:
ETHTOOL_OPTS=”speed 100 duplex full autoneg on”

Let me know if any other changes are required.

ethtool shows its 1000 Mbps FD, Do I still need to hard-code, From which file, it shows such configiration?

Thanks,
Prachi

By: digus

digus — Thu, 16 Jul 2009 17:30:11 +0000

In Ubuntu/Debian for 100-Full, this works for a static IP in /etc/network/interfaces:
—————————-

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo eth0
iface lo inet loopback

# The primary network interface
iface eth0 inet static
pre-up /usr/sbin/ethtool -s eth0 speed 100 duplex full autoneg off
address 192.168.1.101
netmask 255.255.255.0
broadcast 192.168.1.255
network 192.168.1.0
gateway 192.168.1.1

——————–
this should work for DHCP/Auto setup:
——————–

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo eth0
iface lo inet loopback

# The primary network interface
iface eth0 inet dhcp
pre-up /usr/sbin/ethtool -s eth0 speed 100 duplex full autoneg off

By: Ciprian Pantea

Ciprian Pantea — Wed, 17 Jun 2009 21:31:28 +0000

Hmmm… I have 2.6.25 and and I just managed to cut myself access from the server by issuing
ethtool -s eth0 autoneg off speed 1000 duplex full
even when I got this:
ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: umbg
Wake-on: g
Current message level: 0×00000007 (7)
Link detected: yes

I have a new gbit switch there but I can’t get the desired speed… any bright ideas?

By: Hector

Hector — Fri, 22 May 2009 15:56:51 +0000

Hi!! I have some question about this script, I’m enter in this script but some expression I don’t understand.
Well gooo.
#!/bin/sh
ETHTOOL=”/usr/sbin/ethtool”
DEV=”eth0″ // well here in the end the expression no coming “;” well in each expression.
SPEED=”100 duplex full”
case “$1″ in
start) //well here not is start()
echo -n “Setting eth0 speed 100 duplex full…”;
$ETHTOOL -s $DEV speed $SPEED;
echo ” done.”;;
stop) // here too stop ()
;;
esac
exit 0

well this script I’ll work but no change the base 100TX to 10T when restart my Debian, Now I’m use the tools like ethtool for change in the moment, well send me the solution and thank for the post is good information.

By: wuchale

wuchale — Tue, 16 Dec 2008 14:55:11 +0000

Thx for the arcticle. Helped me out.

By: trimethy

trimethy — Sun, 16 Nov 2008 12:49:42 +0000

A variant on the script that handles multiple interfaces and reads the interdfaces from a configuration file.

Enjoy.
Cheers

Interface entry in /etc/default/100Mbs:
INTERFACES=”eth0 eth1 eth3″

/etc/init.d/100Mbs startup script:#!/bin/sh
# Startup script for changing netowork interface parameters
#

ETHTOOL=”/usr/sbin/ethtool”
OPTIONS=”speed 100 duplex full autoneg off”

# Check for a configuration file in /etc/default
if [ ! -f /etc/default/100Mbs ]; then
echo “/etc/default/100Mbs does not exist! – Aborting…”
exit 1
fi

. /etc/default/100Mbs

case “$1″ in
start)
if test “$INTERFACES” != “”; then
for I in $INTERFACES; do
echo -n “Setting ${I} $OPTIONS …”;
$ETHTOOL -s ${I} $OPTIONS;
echo ” done.”
done
fi
;;
stop)
;;
esac
exit 0

By: Vasudeva

Vasudeva — Tue, 12 Aug 2008 14:09:10 +0000

My questions is: my /etc/sysconfig/network-scripts/ifcfg-eth0 is not having details of the NIC speed but when i issue command ethtool eth0 i am getting NIC speed. Where could be this information picking from? Is there any place which ethtool command picks this information?

By: Harka

Harka — Thu, 03 Jul 2008 09:06:11 +0000

Debian:
/etc/network/interfaces

up ethtool -s eth0 speed 100 duplex full autoneg off

Worked for me. Our servers with out-of-the-box OS settings always went half-duplex during auto-negotiation with the router. So this line fixes that.
Ditto for ETHTOOL_OPTS line from article for Redhat.