IPv4/IPv6

The difference between the IPv4 and IPv6
(. 1) may be provided 4,294,967,296 IPv4 addresses, IPv6 will increase the original 32-bit to 128-bit address space, the number 128 is a power of 2　　
(2) using the IPv4 address resolution protocol (the ARP), IPv6 using the propagation Neighbor Solicitation message with the multi-substituted address resolution protocol (ARP). 　　
(3) IPv4 router does not recognize a payload QoS quality of service treatment. Routers in IPv6 Flow Label field can be used to identify a payload QoS quality of service treatment. Loopback address (4) IPv4 are: loop address 127.0.0.1, IPv6 is: 000: 0000: 0000: 0000: 0000: 0000: 0000: 0001 :: 1 may be abbreviated. 　　
(5) In IPv4, the dynamic host configuration protocol (Dynamic Host ConfigurationProtocol, DHCP) to achieve automatic setting the host IP address and its associated configuration. A DHCP server has a pool of IP addresses from the DHCP server lease host IP address, and obtain configuration information (e.g., default gateway, DNS server, etc.), so as to achieve the purpose of automatically setting the host IP address. IP v6 inherited this service automatic configuration of IPv4, and called stateful auto-configuration (stateful autoconfiguration). m.pcwenku.com feeds 　　
(6) IPv4 using the Internet Group Management Protocol (IGMP) manage local subnet group membership, IPv6 using Multicast Listener Discovery (MLD) messages replace IGMP. 　　
(7) built-in security. IPSec developed by the IETF to ensure secret, complete and truthful information through an industry-standard public IP network. IPsec is no longer a complementary part of the IP protocol, IPv6 in IPv6 is IPsec itself has function. IPv4 selective support IPSec, IPv6 automatic support IPSec.