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Compatibility with IPv4 Nodes

::ffff:<IPv4-address>
- IPv4-mapped address
- All IPv4 addresses are mapped on IPv6 address space
  - e.g. 192.168.0.1 => ::ffff:192.168.0.1

Providing ability for IPv6 applications to interoperate with IPv4 applications

Specify the destination, to connect() or sendto()
Getting peer information via accept(), recvfrom(), getpeername()
Do not need to open socket for each protocol

Note: IPv4-mapped address is not always available...

Notes: