How to Assign the IP Address and Default gateway in Linux From Command Line

if config command is used to assign the ip address to a lan card from the command or from the terminal.

Syntax :

 # ifconfig [-v] [-a] [-s]  [interface]

Options :

• -a :    display all interfaces which are currently available, even if down
• -s :    display a short list (like netstat -i)
• -v :   be more verbose for some error conditions

interface : The name of the interface.  This is usually a driver name followed by a unit number, for example eth0 for  the  first Ethernet interface. If your kernel supports alias interfaces, you can specify them with eth0:0 for the first alias of eth0. One can use them to assign a second address. To delete an alias interface use ifconfig eth0:0 down.

Example :

Below command is used to assign ip

# ifconfig eth0 <ip-address>  netmask <yournetmask>  up

Below command is used to check the ip address of eth0 lan card.

# ifconfig  eth0

Command To check the Default Gateway

# route  -n

Commands To  add/change the gateway

# route  del  default gw                                    // delete the default gateway
# route add default gw  <gateway-ipaddress>      
* command to add default gateway