linux网卡操作命令 ,查看Linux下网卡连接状态（up还是down)?
- 调整网卡工作模式
mii-tool -v //查看网卡工作模式
mii-tool -F 100baseTx-FD eth0 //将eth0改为100M,全双工工作模式
mii-tool -r eth0 //恢复网卡工作模式
ethtool eth0 //查询网卡基本设置
ethtool -s eth0 autoneg off speed 100 duplex full //eth0设置为：100M，全双工，非协商
- 网卡配置
ifconfig -h //打印帮助信息
ifconfig -a //打印当前网卡信息
ifconfig eth0 192.168.0.1 netmask 255.255.255.0 //设置eth0 IP及掩码
ifconfig eth0:0 192.168.0.2 netmask 255.255.255.0 //设置eth0的第二个IP
ifconfig eth0:1 down //禁用eth0:0
ifconfig eth0 up //启用eth0
ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx //修改网卡MAC地址
ifconfig eth0 promisc //设置网卡工作于混杂模式下
iwconfig eth0 essid “tao” //设置无线网卡的essid为“tao”
iwconfig eth0 mode Managed //设置无线网卡工作在Managed模式下
iwconfig eth0 mode Ad-hoc //设置无线网卡工作在Ad-hoc模式下
iwconfig eth0 freq 2.422G //设置无线网卡工作频率
3.查看Linux下网卡连接状态（up还是down)?
- 通过mii-tool指令
[root@localhost root]# mii-tool
eth0: negotiated 100baseTx-FD, link ok
eth1: no link
或
[root@localhost root]# mii-tool -v
eth0: negotiated 100baseTx-FD, link ok
product info: vendor 00:50:43, model 2 rev 3
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
eth1: no link
product info: vendor 00:50:43, model 2 rev 3
basic mode: autonegotiation enabled
basic status: no link
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
或
[root@localhost root]# mii-tool -w
21:20:33 eth0: negotiated 100baseTx-FD, link ok
21:20:33 eth1: no link
//mii-tool主要是用于配置网卡工作模式的指令，同时也可以进行查询、监控等工作！
2)ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:09:6B:09:08:FC
inet addr:192.168.10.1 Bcast:192.168.10.255 Mask:255.255.255.0
inet6 addr: fe80::209:6bff:fe09:8fc/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 // RUNNING表示up
- ethtool eth1
Settings for eth1:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 32
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: d
Current message level: 0x00000007 (7)
Link detected: yes //表示物理口up
4、linux查看网卡吞吐量，实时网络带宽
1）dmesg | grep -i eth
2) ethtool eth1
Settings for eth1:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 32
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: d
Current message level: 0x00000007 (7)
Link detected: yes //表示物理口up
查看网络实时带宽
在linux的proc文件系统中，通过查看/proc/net/dev文件
可以得到每个网络接口的吞吐量，但是无法获得实时带宽