Red Hat

Hi all,
I've changed eth0 to (#ethtool eth0):
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on

and (#cat /etc/sysconfig/network-scripts/ifcfg-eth):
ETHTOOL_OPTS="autoneg off speed 1000 duplex full"

But, even after restarting the service and rebooting the server, the ouput of ethtool eth0 is still showing - Auto-negotiation: on.

Any idea why it is behaving that way..?

Thank you for all your help..

Have you checked to see if your NIC actually supports turning off auto-negotiation? What happens when you execute the following fro the command line:

Code:

# ethtool -s eth0 autoneg off

Also, is this NIC bonded or a slave?

What's the full output of ethtool?

According to IEEE 802.3-2002 specification, you cannot disable autonegotiation when using a 1000baseT NIC:

hi all,
thanks for the response

i have set auto-nego to "on" for this NIC, and this is the output for ethtool eth0;

[root@xx ~]# 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: 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
Link detected: yes
[root@xx ~]# ethtool -s eth0 autoneg off
Cannot set new settings: Invalid argument
not setting autoneg
[root@xx ~]#