Step 1: Review Current Network Settings
 Review Current Network Settings
From the command prompt or LXTerminal:
Type the command "ifconfig"
This command will display the current network settings.
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Step 2: Backup the Current Network Configuration
 Backup the Current Network Configuration
it is a good idea to make a backup of the dhcpdc.conf file if you are new to linux:
sudo cp /etc/dhcpcd.conf /etc/dhcdcp.backup
This will allow you to roll back any changes you make.
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Step 3: Modify the Network Settings
 Modify the Network Settings
To edit the network setting you must edit the dhcpcd.conf file to set up a static IP address.
The following command can be used to load the file into an editor update the file:
sudo nano /etc/dhcpcd.conf
Place these lines at the top of the file too set the Ethernet port (eth0) to a static IP address:
interface eth0
static ip_address=10.11.44.124/24
static routers=10.11.44.1
static domain_name_servers=172.16.33.85
Set the address (ip_address) to the IP address you want the Raspberry Pi to occupy.
Set the routers value to the gateway address
If available, set to domain_name_servers to you name servers

Once the file has been updated, use ctrl x to save and exit.
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Step 4: Restart the Raspberry Pi
 Restart the Raspberry Pi
Once the dhcpcd file has been updated, you must restart the Raspberry Pi for the changes to take effect.
Used to following command to restart:
sudo reboot
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Step 5: Test the New Network Setup
 Test the New Network Setup
Use the "ping" command to confirm that the Raspberry Pi is on the network and talking to another computer also on the network.
If you have trouble pinging other computers on the network work, check the following:
1. Confirm that the ethernet cable is firmly connected to the Raspberry Pi and network switch. 
2. Confirm that the ip address, mask and gateway are correct.
3. If pinging a Windows machine, sometimes security setting prevent responding to a ping request.