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If you would like to configure the Raspberry Pi to use DHCP, ''leave the "headless" file empty'', and the Raspberry Pi should be assigned an IP Address dynamically.
'''Optional Configuration:'''
If "RESIZE" is in the "headless" file, the root filesystem will be expanded to the maximum size of the sd card via the service rootfs-resize. If "SWAP"(requires the value in megabytes) exists in the "headless" file, a swap file will be created of the specified size, and then activated.
If you would like to set a static, non-changing, IP Address on your Raspberry Pi, you will need to modify the "headless" file, adding an IP Address, Gateway, and Netmask, to the file for the configurations to work properly(see samples configs below).
'''Required Configuration:'''
IPADDR=[IP Address of Raspberry Pi]
GATEWAY=[IP Address of router/gateway]
'''Optional Configuration:'''
If "RESIZE" is in the "headless" file, the root filesystem will be expanded to the maximum size of the sd card via the service rootfs-resize. If "SWAP"(requires the value in megabytes) exists in the "headless" file, a swap file will be created of the specified size, and then activated.
== Headless Mode DHCP Configuration -- How do I find my IP Address? ==
Once Headless Mode has been Enabled, and the Raspberry Pi has finished booting, the IP Address of the Raspberry Pi will be read out through the speakers or headphones that are connected to the Raspberry Pi. Additionally, the IP Address will be flashed through the LED on the Raspberry Pi soon '''after''' the IP Address is read through the speakers.
1 - 9 short flashes indicate the digits 1 - 9
== Known Bugs and Features ==
Two IP Addresses - When switching in between Headless Mode Configuration states, static ip to dynamic ip, or dynamic ip to static ip, '''both''' IP Addresses, from '''each''' configuration will be active for the single boot, until a reboot takes place.
Graphical Mode Not Disabled - Headless Mode does not disable X, and can run in both Run Level 3 or 5. This means that if you are not planning on using X while in Headless Mode, you should switch to Run Level 3 to save memory.