IPv4 Link Local

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To participate in wide-area IP networking, a host needs to be configured with IP addresses for its interfaces, either manually by the user or automatically from a source on the network such as a Dynamic Host Configuration Protocol (DHCP) server. Unfortunately, such address configuration information may not always be available. It is therefore beneficial for a host to be able to depend on a useful subset of IP networking functions even when no address configuration is available.

It means link-local address are used when host is not able to get any network configuration from

then it automatically take IP from pool of 169.254.0.0/16 (169.254.0.0 – 169.254.255.255) mentioned in RFC 3927

Process:

  1. Take any random IP from above pool
  2. Check if IP is not taken by others using broadcast via ARP
  3. If IP is taken then go back to step 1
  4. If IP is not taken, then assign the IP to yourself and be ready for networking.

Important points to be noted


Reference:

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