Special Address Definitions

IPv6 Wildcard Address(::)
- const struct in6_addr in6addr_any;
  - sin6.sin6_addr = in6addr_any; // assignment
- IN6ADDR_ANY_INIT
  - struct in6_addr in6 = IN6ADDR_ANY_INIT; //initialization
IPv6 Loopback Address(::1)
- const struct in6_addr in6addr_loopback;
  - sin6.sin6_addr = in6addr_loopback; //assignment
- IN6ADDR_LOOPBACK_INIT
  - struct in6_addr in6 = IN6ADDR_LOOPBACK_INIT; //initialization

IPv6 Wildcard Address(::)