Negotiation - How to Configure Negotiation in Linux

# ethtool eth1
Settings for eth1:
　　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: 1000Mb/s
　　Duplex: Full
　　Port: Twisted Pair
　　PHYAD: 1
　　Transceiver: internal
　　Auto-negotiation: on
　　Supports Wake-on: g
　　Wake-on: d
　　Link detected: yes

ethtool -s eth0 autoneg off speed 100 duplex full
ethtool -s eth0 speed 1000
ethtool -s eth0 autoneg off
ethtool -s eth0 duplex full

ETHTOOL_OPTS="autoneg on speed 1000 duplex full"

DEVICE=eth0
BOOTPROTO=static
IPADDR=192.168.0.100
NETMASK=255.255.255.0
ONBOOT=yes
ETHTOOL_OPTS="autoneg off speed 100 duplex full"
TYPE=Ethernet