LEGRAND Raritan SRC-0100, User Manual

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Chapter 1: Introduction
6
APIPA and Link-Local Addressing
SRC supports Automatic Private Internet Protocol Addressing (APIPA).
With APIPA, your SRC 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 SRC using
the link-local address/host name. Those in a different subnet cannot
access it.
Exception: SRC in the Port Forwarding mode does not support APIPA.
See
Setting the Cascading Mode
(on page 187).
Once the SRC 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 SRC, but no IP address is assigned to the
SRC.
This may be caused by the absence or malfunction of DHCP servers
in the network.
Note: Configuration by connecting the SRC to a computer using a
network cable is an application of this scenario. See
Connecting the
SRC to a Computer
(on page 21).

The SRC 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
SRC. See
Configuring Network Settings
(on page 169).

Host name - pdu.local:
You can type https://pdu.local to access the SRC instead of typing the
link-local IP address.
Retrieval of the link-local address:

See
Device Info
(on page 86).