Summary of MAC addresses and Ifconfig commands permanently changed under Linux

1. Fix a MAC address, especially when using multiple virtual machines

In the Linux environment:
Log in as root and add these three sentences to the/etc/rc.d/rc.local.

Ifconfig eth0 Down
ifconfig eth0 hw ether 00:0c:18:ef:ff:ed
Ifconfig eth0 up

So again after the reboot is not afraid of Mac recovery.

2. Ifconfig order (reprint http://www.cnblogs.com/taobataoma/archive/2007/12/27/1016689.html)

Ifconfig [Interface]

Interface is an optional option. Suppose this is not added. Displays information about all network cards in the system. Assuming this option is added, the specified NIC information is displayed

For example: Ifconfig eth0

Eth0 Link encap:ethernet HWaddr 00:0c:29:f3:3b:f2 inet addr:192.168.0.10 bcast:192.168.0.255 Mask : 255.255.255.0 up broadcast RUNNING multicast mtu:1500 metric:1 RX packets:78 errors:0 dropped:0 overruns:0 frame:0 TX packets:104 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:11679 (11.4 Kb) TX bytes:14077 (13.7 Kb) interrupt:10 Base address:0x1080

We can see

First line: Connection type: Ethernet (Ethernet) HWADDR (Hardware MAC address)

Second line: IP address, subnet, mask of network card

Third line: Up (for Nic on) RUNNING (network cable on behalf of the NIC is connected) multicast (support multicast) mtu:1500 (Maximum transmission Unit): 1500 bytes

Line fourth to fifth: Receive, send packet statistics

Line seventh: Receive, send data byte count statistics.

2, ifconfig configuration network card

Configure the IP address of the network card

Ifconfig eth0 192.168.0.1 netmask 255.255.255.0

Configure the IP address and the 24-bit mask on the eth0 on the 192.168.0.1. What if you want to configure a 192.168.1.1/24 IP address on the eth0 again? Use the following command

Ifconfig eth0:0 192.168.1.1 netmask 255.255.255.0

Then use the IFCONIFG command to view. will be able to see the information of two network cards. respectively: Eth0 and eth0:0. If you want to add IP again, then the name of the network card is: eth0:1, eth0:2 ... you can fill in a few. Ok!

Configure the hardware address of the NIC

ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx

The hardware address of the network card is changed, at this time you can deceive the LAN IP address of the state.

Disable the network card

Ifconfig eth0 Down

Enable the network card

Ifconfig eth0 up

Summary of MAC addresses and Ifconfig commands permanently changed under Linux