What is IPv6?

IP version 6 (formerly called as IPng)
The Next Generation Internet Protocol
128bit address space (>> 32bit in IPv4)
solve severe shortage of addresses on the Internet
Note: situation with IPv4 is very serious on China.
"Simple" architecture for high-speed networks
Aggregatable Address
Extension header
Plug & Play
Stateless Address Autoconfiguration
Security
IPsec
Mobility
Mobile IPv6