code and solution: June 2014

To configure the board to use DHCP or static IP settings:

You can use a terminal window after accessing the Linux^® desktop. See Access the Linux Desktop Using Computer Peripherals.
Display the contents of the /etc/network/interfaces file. Enter:
```
cat /etc/network/interfaces 
```
If the board is configured to use DHCP services (the default configuration), dhcp appears at the end of the following line:
```
iface eth0 inet dhcp
```
If the board is configured to use static IP settings, static appears at the end of the following line:
```
iface eth0 inet static
```
Create a backup of the /etc/network/interfaces file. Enter:
```
sudo cp /etc/network/interfaces /etc/network/interfaces.backup
```
If prompted, enter the root password.
Edit interfaces using a simple editor called nano. Enter:
```
sudo nano /etc/network/interfaces
```
Edit the last word of line that starts with iface eth0 inet.

To use DHCP services, change the line to:
```
iface eth0 inet dhcp
```
To use static IP settings, change the line to:
```
iface eth0 inet static
```
For static IP settings, add lines for address, netmask, and gateway. For example:
```
iface eth0 inet static
    address 192.168.1.2
    netmask 255.255.255.0
    gateway 192.168.1.1
```
For static IP settings:
- The value of the subnet mask must be the same for all devices on the network.
- The value of the IP address must be unique for each device on the network.
For example, if the Ethernet port on your host computer has a network mask of 255.255.255.0 and a static IP address of 192.168.1.1, set:
- netmask to use the same network mask value, 255.255.255.0.
- address to an unused IP address, between 192.168.1.2 and 192.168.1.254.
Save the changes and exit nano:
1. Press Ctrl+X.
2. Enter Y to save the modified buffer.
3. For "File Name to Write: /etc/network/interfaces", press Enter.
4. The nano editor confirms that it "Wrote # lines" and returns control to the command line.
Reboot the board. In MATLAB^® Command Window, enter:
```
h = raspberrypi
h.execute('sudo shutdown -r now')
```
Test the IP settings by logging in to the board over a telnet session.

fixed ip address RPi