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Enabling LINUX
Driver Default
Settings
14
On Red Hat distributions, you can specify "ethtool -s" parameters in the
ifcfg-ethx scripts using the ETHTOOL_OPTS keyword. The specified
ethtool parameters are set up during ifup. For example, go to the following
directory:
/etc/sysconfig/network-scripts/ifcfg-eth0
Add the following line to the script:
ETHTOOL_OPTS="wol g speed 100 duplex half autoneg off"
Table 2. Ethtool Utility Examples
Action
Display current speed, duplex, and link
status
Change speed, duplex mode, and
autonegotiation status to 100Mbps
half duplex, and no autonegotiation
Change speed, duplex mode, and
autonegotiation status to 100Mbps full
duplex mode, and no autonegotiation
Display flow control settings
Turn off flow control
Display offload settings
Turn off TCP Segmentation Offload
(TSO)
Display statistics
Perform a self-test on an interface that
is up and running
See Table 3 for the default settings of the Linux driver.
Feature
Speed
Flow control
ethtool eth0
ethtool -s eth0 speed 100
duplex half autoneg off
ethtool -s eth0 speed 100
duplex full autoneg off
ethtool -a eth0
ethtool -A eth0 autoneg off rx
off tx off
ethtool -k eth0
ethtool -K etho tso off
ethtool -S eth0
ethtool -t eth0
Table 3. Linux Driver Settings
Default Setting
Autonegotiation with all speeds
advertised
Autonegotiation with Rx and Tx
advertised
Commands