How to change Raspberry Pi Dynamic IP to Static IP

1. Checking current network by type command.

cat /etc/network/interfaces                      


You will see below.

Look at line 


iface eth0 inet dhcp                            

It shown network (eth0) be dhcp.

2. Checking current IP Address by type command. 

ifconfig                                        

You will see below.

Look at eth0 you will see.

inet addr:192.168.137.2  Bcast:192.168.137.255  Mask:255.255.255.0

It 's mean.

ip address 192.168.137.2                       
broadcast 192.168.137.255                      
netmask 255.255.255.0                          

3. Checking current gate way type command.

netstat -nr                                                              

It will shown.

Look at column Destination and Gateway. It mean.

destination network 192.168.137.0             
gateway 192.168.137.1                         


4. Chang to Static IP

   Now you already get current network information enough. If you want to set my IP address to 192.168.1.2. You must editor file /etc/network/interfaces by vi or nano up to you.

sudo vi /etc/network/interfaces               
or 
sudo nano /etc/network/interfaces             

change line
iface eth0 inet dhcp                          

To be.

iface eth0 inet static                        
   address 192.168.137.2                      
   netmask 255.255.255.0                      
   network 192.168.137.0                      
   broadcast 192.168.137.255                  
   gateway 192.168.137.1                      


5. Save and reboot

sudo reboot

Now you will connect to Raspberry Pi by IP Address 192.168.1.2

ifconfig

6. Enjoy !