linux/centos如何查看网卡信息

linux/centos如何查看网卡是100M还是1000M？检查100兆还是千兆（1GBPS）带宽接入，请看下面命令

[root@www.ctohome.com]# mii-tool -V

mii-tool.c 1.9 2000/04/28 00:56:08 (David Hinds)

SIOCGMIIREG on eth0 failed: Input/output error

eth0: negotiated 100baseTx-FD, link ok

[root@www.ctohome.com]# mii-tool -v

SIOCGMIIREG on eth0 failed: Input/output error

eth0: negotiated 100baseTx-FD, link ok

product info: vendor 00:aa:00, model 57 rev 0

basic mode: autonegotiation enabled

basic status: autonegotiation complete, link ok

capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

[root@www.ctohome.com]# ethtool eth0

Settings for eth0:

Supported ports: [ TP ]

Supported link modes: 10baseT/Half 10baseT/Full

100baseT/Half 100baseT/Full

1000baseT/Full

Supports auto-negotiation: Yes

Advertised link modes: 10baseT/Half 10baseT/Full

100baseT/Half 100baseT/Full

1000baseT/Full

Advertised auto-negotiation: Yes

Speed: 100Mb/s

Duplex: Full

Port: Twisted Pair

PHYAD: 1

Transceiver: internal

Auto-negotiation: on

Supports Wake-on: pumbag

Wake-on: g

Current message level: 0x00000001 (1)

Link detected: yes

要测试是否是1000M端口，最保险的说用wget测试一个对方的带宽足够大的下载地址：

wget http://cachefly.cachefly.net/100mb.test
--2011-03-14 22:19:12-- http://cachefly.cachefly.net/100mb.test
Resolving cachefly.cachefly.net... 205.234.175.175

Connecting to cachefly.cachefly.net|205.234.175.175|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 104857600 (100M) [application/octet-stream]

Saving to: `100mb.test.2'

100%[===================================================================================================================>] 104,857,600 39.1M/s in 2.6s

2011-03-14 22:19:14 (39.1 MB/s) - `100mb.test.2' saved [104857600/104857600]

如果下载速度能超过15MB/s，那么不是100M端口了，通常就是1000M端口

如果是独立服务器，可以通过下面命令核查网卡端口：

[root@www.ctohome.com ]# ethtool eth0

Settings for eth0:

Supported ports: [ TP ]

Supported link modes: 10baseT/Half 10baseT/Full

100baseT/Half 100baseT/Full

1000baseT/Full

Supports auto-negotiation: Yes

Advertised link modes: 10baseT/Half 10baseT/Full

100baseT/Half 100baseT/Full

1000baseT/Full

Advertised auto-negotiation: Yes

Speed: 1000Mb/s

Duplex: Full

Port: Twisted Pair

PHYAD: 1

Transceiver: internal

Auto-negotiation: on

Supports Wake-on: pumbag

Wake-on: g

Current message level: 0x00000001 (1)

Link detected: yes