How to get ethernet card speed as 1000Mb/s into Centos

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I have setup a network which fully supported 1000Mb/s speed. Same network shows 1000Mb/s speed in Windows system but in Centos it is showing 100Mb/s speed. Why?

My ethtool output as follow

 [root@localhost ~]# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 2
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes
centos6.5
asked on Server Fault Jul 9, 2014 by Sohal Sharma • edited Jul 22, 2014 by Daniel

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