ethtool - 리눅스에서 네트워크 링크 상태 / 속도 확인하기

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]