V6 expression of IPV4

The IPV6 V6 representation ensures the compatibility between IPV4 and IPv6 nodes in a hybrid network environment. The IPV6 address provides a combination of colons and dot notation, you can embed an IPv4 address into an IPv6 address. Specify the hexadecimal value for 96 digits on the leftmost side and the decimal value for 32 digits on the rightmost side to indicate the embedded IPv4 address. The two types of IPv6 addresses use this optional format: IPv6 addresses mapped through IPv4 are used to express IPv4 nodes as IPv6 addresses. It allows IPv6 applications to communicate directly with IPv4 applications. For example, 0: 0: 0: 0: 0: ffff: 192.1.56.10 and: ffff: 192.1.56.10/96 (short format ). IPv4-compatible IPv6 addresses. This type of address is used for tunneling. It allows IPv6 nodes to communicate with each other through the IPv4 infrastructure. For example, 0: 0: 0: 0: 0: 0: 192.1.56.10 and: 192.1.56.10/96 (short format ). In addition, the int accept (int sockfd, struct sockaddr * addr, socklen_t * addrlen) function fills in the client address "should" have the same address family as the initial socket (sockfd. Based on the above two points: In a hybrid network node (both IPV4 and IPV6 are supported), the server accepts the client connection request and uses the address conversion function const char * inet_ntop (int af, const void * src, char * dst, socklen_t size); the IPV4 address of the converted client should be in the format of: ffff: 192.1.56.10.