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setting NIC speed



when a NIC supports 1000base-T but its speed is at 100base-T and i want to change it to 100Mb/s. How do i really do that?

# ethtool eth4
Settings for eth4:
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 pause frame use: No
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: g
Wake-on: g
Current message level: 0x000000ff (255)
Link detected: yes

# ethtool -s eth4 speed 1000
Cannot set new settings: Invalid argument
  not setting speed

--
Regards,

Umarzuki Mochlis
http://debmal.my

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