Linux/Ubuntu2011.12.11 21:03
물론 socket을 건드려야 해서 root 권한으로 해야만 원하는 값을 얻을수 있다.
$ ethtool eth0
Settings for eth0:
Cannot get device settings: Operation not permitted
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x000000ff (255)
Cannot get link status: Operation not permitted



$ sudo ethtool eth0
Settings for eth0:
        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
        Link partner advertised link modes:  Not reported
        Link partner advertised pause frame use: No
        Link partner advertised auto-negotiation: No
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: pg
        Wake-on: d
        Current message level: 0x000000ff (255)
        Link detected: yes 

[링크 : http://www.cyberciti.biz/faq/howto-setup-linux-lan-card-find-out-full-duplex-half-speed-or-mode/]

아래는 C 코드로 작성한 링크 속도 확인방법
[링크 : http://stackoverflow.com/questions/2872058/get-link-speed-programmatically]
Posted by 구차니
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