简介:IPv4的地址空间已经耗尽,但目前绝大多数的应用都是基于IPv4协议的,从IPv4向IPv6的过渡将是一个相当长的过程.在过渡期间,必须要实现两者之间的平稳过渡.目前解决过渡问题的基本技术主要有双协议栈,隧道和网络地址转换——协议转换.在不同环境下,要因地制宜,选择出合理的转换机制,成功地完成过渡.
简介:Becauseofrapiddevelopmentinnetworktechnology,Internetusagehasbecomewidespread.Itallowsuserswithsensingdevicestoobtainmedicaldataforhealthcare,suchasphysiologicalsignals,voice,andvideostreamsfromtelemedicinesystems,andtosendthehealthcaredatatoback-enddatabasesystems,creatingaubiquitoushealthcareenvironment.However,thisenvironmentrequiresawidespreadandsuitablenetwork.IPv6(Internetprotocolversion6)isthenext-generationInternetprotocolthatwillbetheprotocoloffuturenetworks;itimprovesmanyshortcomingsofIPv4.Inthispaper,weproposeanIPv6/IPv4U-home-caretestsystemandanalyzethenetwork’sparametersthoughaseriesoftestsbyadjustingnetworkparameterstofindtheoptimaldesignforapplicationsintheIPv6/IPv4U-home-careservicesoastoassuregoodperformanceandhighquality.