Abstract: The transition of IPv4 to IPv6 needs to experience a long period of time. Therefore, a suitable IPv6 transition strategy for the intranet must be researched to ensure the normal communication between IPv4 network and IPv6 network. On the basis of several common transition technologies, this paper uses Netfilter expansion module in conjunction with Xtables-addons plug-ins, in order to achieve the program of the IVI mechanism quickly and efficiently. Then a detailed analysis to the concrete realization of the IVI matching module and IVI object module in this program is given. And it is applied to the test in a real network. IVI translation mechanism can effectively solve the communicate problem between IPv4 host and IPv6 host. It provides practical application reference to deployed intranet transition network widely.