June 2018
16 Legrand PDU User Guide
1U Products
One Legrand PDU
1U bracket pack and screws
2U Products
One Legrand PDU
2U bracket pack and screws
APIPA and Link-Local Addressing
The Legrand PDU supports Automatic Private Internet Protocol Addressing (APIPA).
With APIPA, your Legrand PDU automatically configures a link-local IP address and a link-local host name
when it cannot obtain a valid IP address from any DHCP server in the TCP/IP network.
Only IT devices connected to the same subnet can access the Legrand PDU using the link-local
address/host name. Those in a different subnet cannot access it.
Exception: Legrand PDU in the Port Forwarding mode does not support APIPA. See Setting the Cascading
Mode (on page 150).
Once the Legrand PDU can get a DHCP-assigned IP address, it stops using APIPA and the link-local
address is replaced by the DHCP-assigned address.
Scenarios where APIPA applies:
DHCP is enabled on the Legrand PDU, but no IP address is assigned to the Legrand PDU.
This may be caused by the absence or malfunction of DHCP servers in the network.
Note: Configuration by connecting the Legrand PDU to a computer using a network cable is an
application of this scenario. See Connecting the Legrand PDU to a Computer (on page 30).
The Legrand PDU previously obtained an IP address from the DHCP server, but the lease of this IP
address has expired, and the lease cannot be renewed, or no new IP address is available.
Link-local addressing:
IPv4 address:
Factory default is to enable IPv4 only. The link-local IPv4 address is 169.254.x.x/16, which ranges
between 169.254.1.0 and 169.254.254.255.
IPv6 address:
A link-local IPv6 address is available only after IPv6 is enabled on the Legrand PDU. See Configuring
Network Settings (on page 140).
Host name - pdu.local:
You ca
n type https://pdu.local to access the Legrand PDU instead of typing the link-local IP address.
For retrieval of the link-local address, see Device Info (on page 70).
Before You Begin
Before beginning the installation, perform the following activities:
Unpack the product and components
Prepare the installation site
Check the branch circuit rating
Fill out the equipment setup worksheet
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