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当网络主机改变网络接入点时,传统的TCP/IP协议无法正常运作,这是由于IP地址的双重作用(既是主机的名也指明主机当前的网络位置)引起的.支持主机移动的网络协议SHMUD(Supporting HostMobility Using DNS)用域名作为主机名,保留主机IP地址指示其当前网络位置的作用,解决了这一问题.SHMUD以域名服务系统作为它的位置目录,在每个移动主机可能访问的网络中安装移动代理.当移动主机从一个网络移动到另一个网络,并通过DHCP服务器获得了当地网络的一个IP地址后,向它的归属代理(Home Agent)发送登记请求,归属代理根据该移动主机的请求通知DNS服务器,DNS服务器就更新该移动主机的域名-地址映射,这样网络中其它主机利用域名与该移动主机通信时就可以直接将IP报文发往该移动主机的当前IP地址了.在移动主机改变网络接入点的过程中,可能与其它主机正在进行通信,为保证通信不被中断(称为平滑越区),SHMUD提出了一种新的机制以实现主机的平滑越区.此外,SHMUD还提供必要的安全措施使各个移动代理和DNS服务器不受网络攻击.最后,给出了SHMUD的原型系统 和性能分析.与其它支持主机移动的路由方案如Mobile-IP相比,SHMUD实现了路径优化、资源的分布式 管理、平滑越区以及身份验证等.此外,它只需要在移动主机可能访问的网络中安
When a network host changes a network access point, the traditional TCP / IP protocol does not work properly due to the dual role of the IP address (both the name of the host and the host’s current network location). Network protocols that support host movement SHMUD (Supporting Host Mobility Using DNS) resolves this problem by using the domain name as the host name, preserving the role of the host IP address indicating its current network location, and SHMUD uses the domain name service system as its location directory, possibly accessible on each mobile host Network Mobile Agent Installation When a mobile host moves from one network to another and obtains an IP address of the local network through the DHCP server, it sends a registration request to its Home Agent, The host’s request notifies the DNS server that the DNS server updates the domain name-address mappings of the mobile host so that other hosts in the network can directly send IP packets to the mobile host’s current IP address when communicating with the mobile host using the domain name In the mobile host to change the network access point in the process, may be in communication with other hosts, to ensure that pass Without interruption, called smoothing, SHMUD proposes a new mechanism to achieve a graceful host-crossing. In addition, SHMUD also provides the necessary security measures to protect mobile agents and DNS servers from cyber attacks.Finally, SHMUD’s prototype system and performance analysis are given.Compared with other routing schemes that support host mobility such as Mobile-IP, SHMUD implements path optimization, distributed management of resources, smoothing of zones and authentication, etc. In addition, it only Need to be on the mobile host may visit the network security