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IPv6 Core (cont'ed):
Basic Socket API: Port Space
Co-existence of IPv4 and IPv6 socket on the same port is not allowed by default.
- Port space is shared between IPv4 and IPv6.
- With IPV6_V6ONLY socket option set, port space is partially split.
On some systems, port space is shared but automatically allows IPv4 socket to bind on the same port.
On other systems, port space is split.