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Getting Started

3.3.2 AutoIP

The unit ships with a default IP address of 0.0.0.0, which automatically enables Auto IP

within the unit. AutoIP is an alternative to DHCP that allows hosts to automatically obtain an

IP address in smaller networks that may not have a DHCP server. A range of IP addresses

(from 169.254.0.1 to 169.254.255.1) has been explicitly reserved for AutoIP-enabled

devices. The range of Auto IP addresses is not to be used over the Internet.

If your unit cannot find a DHCP server, and you have not manually assigned an IP address

to it, the unit automatically selects an address from the AutoIP reserved range. Then, your

unit sends out a (ARP) request to other nodes on the same network to see whether the

selected address is being used.

If the selected address is not in use, then the unit uses it for local subnet communication.



If another device is using the selected IP address, the unit selects another address from the

AutoIP range and reboots itself. After reboot, the unit sends out another ARP request to see

if the selected address is in use, and so on.

AutoIP is not intended to replace DHCP. The unit will continue to look for a DHCP server on

the network. If a DHCP server is found, the unit will switch to the DHCP server-provided

address and reboot.

Note: If a DHCP server is found, but it denies the request for an IP address, the unit does

not attach to the network, but waits and retries.

AutoIP can be disabled by setting the unit’s IP address to 0.0.1.0. This setting enables

DHCP but disables AutoIP.

3-4 XPort™ User Manual and Development Kit

Lantronix XPort User Manual

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