nic

#CentOS
#Fedora
[inetrfaces]
sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0
#static
DEVICE=eth0                 
BOOTPROTO=static            
IPADDR=192.168.1.1          
NETMASK=255.255.255.0       
NETWORK=192.168.1.0         
GATEWAY=192.168.1.254       
BROADCAST=192.168.1.255     
HWADDR=XX:XX:XX:XX:XX:XX　　
ONBOOT=yes                  
#dhcp
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
[dns]
sudo vi /etc/resolv.conf
search domainname           //test.domainname
nameserver 168.95.1.1      
nameserver 208.67.220.220  
[up&down]
sudo ifup eth0
sudo ifdown eth0
sudo /etc/init.d/network restart
[virtual nic-CentOs]
sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0:0
DEVICE=eth0:0
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.2.254
NETMASK=255.255.255.0
NETWORK=192.168.2.0
BROADCAST=192.168.2.255
sudo ifup eth0:0
[virtual nic-Ubuntu]
vi /etc/network/interfaces
#static
auto eth0
iface eth0 inet static
address 192.168.1.1
netmask 255.255.255.0
gateway 192.168.1.254
#dhcp
auto eth0
iface eth0 inet dhcp
/etc/init.d/networking restart
auto eth0:0               
iface eth0:0 inet static  
address 192.168.2.254
netmask 255.255.255.0
broadcast 192.168.2.255