APIPA and Link-Local Addressing

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The HPDU supports Automatic Private Internet Protocol Addressing (APIPA).
With APIPA, the HPDU 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 HPDU using the link-local address/host name. Those in a different subnet cannot access it.
After the HPDU 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 HPDU, but no IP address is assigned. This may be caused by the absence or malfunction of DHCP servers in the network.

Note - Configuration by connecting the HPDU to a computer using a network cable is an application of this scenario.
The HPDU 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 you enable IPv6 on the HPDU.
Host name – to access the HPDU instead of typing the link‑local IP address. Type https://pdu.local.