| Now the internet mainly bases on IPv4 protocol.IPv4 had promoted successfully the development of the internet. However, with the spread of internet, the deficiency of IPv4 gets more and more obvious. But IPv6 protocol can work out it, so that IPv6 is sure to be the inevitable trend of protocol development, and then IPv6 is the kernel of next generation network (NGN). It will provide strongly sustain for next generation network. IPv6 is certainly to replace of IPv4 and to become the mostly internet protocol.Moreover, with our society's development, the applications of embedded system have been wider and wider, and embedded system has made people's life more convenient. Currently it is widespread to use IPv4 protocol in embedded system. And it is very significant to use IPv6 protocol in embedded system in future.On researching characteristics of embedded system and IPv6 protocol, it is studied mainly how to make complicated TCP/IPv6 variable for embedded system.The great amelioration of IPv6 is on the network layer compared to IPv4, thus the network layer of IPv6 will be studied significantly. For the use of embedded system, extreme header of IPv6 protocol is not implemented. Furthermore, only two protocols-TCP protocol and ICMPv6 protocol will be sustained by IPv6 protocol. IPv6 protocol is responsible to estimate datagram category and to pack the segments from the upper layer. ICMPv6 protocol realizes two essential functions, one is to send out corresponding neighbor advertisement message to responds to neighbor solicitation message for resolving self IP address to its MAC address, the other is to send out echo reply message to respond to echo request message for test network connectivity. With regard to TCP protocol, except for its fake datagram header used for check sum calculating, it is the same in IPv6 with in IPv4. HTTP protocol is merely... |
