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以太网连接的千兆字节速度

tag-icon • tag-icon networking ethernet
以太网连接的千兆字节速度

我的操作系统是 Ubuntu 12.04。我的电缆调制解调器是摩托罗拉 surfboard extreme。我的康卡斯特电缆是 58 mbps。我使用的是贝尔金路由器。我的网卡是 NVIDIA Corporation MCP51 以太网控制器（rev a3）。

我遇到的问题是，我的速度只有 100 mb/s：

$ sudo ethtool eth0
[sudo] password for myuser: 
Settings for eth0:
    Supported ports: [ MII ]
    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:  100baseT/Full 
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Speed: 100Mb/s
    Duplex: Full
    Port: MII
    PHYAD: 1
    Transceiver: external
    Auto-negotiation: on
    Supports Wake-on: g
    Wake-on: d
    Link detected: yes

当我尝试将速度切换到 1000 时，我立即失去网络连接：

$ sudo ethtool -s eth0 speed 1000 duplex full
$ sudo ethtool eth0
Settings for eth0:
    Supported ports: [ MII ]
    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:  1000baseT/Full 
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Speed: Unknown!
    Duplex: Unknown! (255)
    Port: MII
    PHYAD: 1
    Transceiver: external
    Auto-negotiation: on
    Supports Wake-on: g
    Wake-on: d
    Link detected: no

我不得不将其改回 100 才能恢复网络连接。是什么原因导致了这个问题？

答案1

首先要尝试的是另一根以太网电缆。有些只能达到 100mbps。

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