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Creating a Dual-Stack Socket By default,an IPv6 socket created on Windows Vista and later only operates over the IPv6 protocol. In order to make an IPv6 socket into a dual-stack socket,the setsockopt function must be called with theIPV6_V6ONLY socket optionto set this value to zero before the socket is bound to an IP address.

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  • What is a socket?

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  • What is a dual-stack socket?

  • For a dual-stack socket in listening mode, this means that any accepted IPv4 connections will return an IPv4-mapped IPv6 address. For a dual-stack socket that is connecting to an IPv4 destination, the SOCKADDR structure passed to connect must be an IPv4-mapped IPv6 address.

  • How do I make an IPv6 socket into a dual-stack socket?

  • In order to make an IPv6 socket into a dual-stack socket, the setsockopt function must be called with the IPV6_V6ONLY socket option to set this value to zero before the socket is bound to an IP address.

  • Can I use IP_pktinfo on a dual-stack datagram socket?

  • The IPv4-mapped IPv6 address format can only be used on a dual-stack socket. On a dual-stack datagram socket, if an application requires the LPFN_WSARECVMSG (WSARecvMsg) function to return packet information in a WSAMSG structure for datagrams received over IPv4, then IP_PKTINFO socket option must be set to true on the socket.

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