H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 112)

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Figure 44 IPv4 packet header format and basic IPv6 packet header format
Larger address space
The source and destination IPv6 addresses are 128 bits (or 16 bytes) long. IPv6 can provide 3.4 x 10 38
addresses to meet the requirements of hierarchical address division and the allocation of public and
private addresses.
Hierarchical address structure
IPv6 uses the hierarchical address structure to speed up route lookups and reduce the IPv6 routing table
size through route aggregation.
Address autoconfiguration
To simplify host configuration, IPv6 supports stateful and stateless address autoconfiguration.
• Stateful address autoconfiguration enables a host to acquire an IPv6 address and other
configuration information from a server (for example, a DHCP server).
• Stateless address autoconfiguration enables a host to automatically generate an IPv6 address and
other configuration information by using its link-layer address and the prefix information advertised
by a router.
To communicate with other hosts on the same link, a host automatically generates a link-local address
based on its link-layer address and the link-local address prefix (FE80::/10).
Built-in security
IPv6 defines extension headers to support IPsec. IPsec provides end-to-end security for network security
solutions and enhances interoperability among different IPv6 applications.
QoS support
The Flow Label field in the IPv6 header allows the device to label the packets and facilitates the special
handling of a flow.
Enhanced neighbor discovery mechanism
The IPv6 neighbor discovery protocol is implemented through a group of Internet Control Message
Protocol version 6 (ICMPv6) messages to manage the information exchange among neighboring nodes
on the same link. The group of ICMPv6 messages replaces Address Resolution Protocol (ARP) messages,