CentOS Network Configuration-Setup a new NIC

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　　Environment:
　　CentOS6 minimal install without XWindow
　　
　　To permanent change the IP, Submask, DNS etc
　　
　　Step 1: Configure Hostname
　　

cd /etc/sysconfig
vi network
　　# Modify HOSTNAME:
　　HOSTNAME=myHostname
　　
　　Step 2: Configure NIC

cd /etc/sysconfig/network-scripts
# There may have different filenames in different computers.
# But the naming rule is ifcfg-*
vi ifcfg-eth0
　　# Add the following K/V  pair
　　
　　# NIC name
　　DEVICE=LocalNIC
　　IPADDR=192.168.1.200

SUBMASK=255.255.255.0

GATEWAY=192.168.1.1

HWADDR=00:0C:29:42:59:92

NM_CONTROLLED=yes
　　# Turn this when you need this NIC enable when system startup
　　# If this option is NO. That means you can not access network by this NIC.

ONBOOT=yes
　　
　　Step 3 : Configure DNS

cd /etc
vi resolv.conf
　　# Add the following K/V pair
　　# You can add most 3 DNS server here.
　　nameserver 8.8.8.8
　　nameserver 8.8.4.4
　　
　　Step 4 : Reboot computer and check you network
　　
　　To temporary change your network configuration you can use the following commands
　　
　　Set IP address
　　
　　ifconfig eth0 192.168.1.2 submask 255.255.255.0
　　
　　Set gateway
　　
　　route add default gw 192.168.1.1
　　
　　Set DNS server
　　
　　Ref Step 3
　　
　　****************************************************************************
　　
　　If you are using VMWare. The vm's MAC addr can not be changed like above.
　　Or you will be 
　　You should modify the vm's ".vmx" file.
　　
　　Find out the "Your_VM_Name.vmx" file in your vm dir.
　　Use text editor (Notepad or vi) open that file.
　　
　　Locate those line:
　　

　　ethernet0.generatedAddress = "00:0c:29:ea:00:72"
　　uuid.location = "56 4d 8b 23 04 2e b0 64-5f cd a3 12 c3 ea 00 72"
　　uuid.bios = "56 4d 8b 23 04 2e b0 64-5f cd a3 12 c3 ea 00 72"
　　
　　The value of "ethernet0.generatedAddress" in this format "00:0c:29:??:??:??"
　　DO NOT change the first 6 chars!
　　
　　For "uuid.bios", you can only change the last 6 char.
　　Set the same value as "ethernet0.generatedAddress"
　　
　　Save this vmx file and start your vm. you will find the MAC had been changed.