RFC 2767 (rfc2767) - Page 2 of 13

Dual Stack Hosts using the "Bump-In-the-Stack" Technique (BIS)

RFC 2767               Dual Stack Hosts using BIS          February 2000


   not need to know whether target hosts are IPv6 ones. That is, this
   allows them to communicate with other IPv6 hosts using existing IPv4
   applications; thus it seems as if they were dual stack hosts with
   applications for both IPv4 and IPv6. So they can expand the territory
   of dual stack hosts.  Furthermore they can co-exist with other
   translators because their roles are different.

   This memo uses the words defined in [IPV4], [IPV6], and [TRANS-MECH].

2. Components

   Dual stack hosts defined in RFC 1933 [TRANS-MECH] need applications,
   TCP/IP modules and addresses for both IPv4 and IPv6. The proposed
   hosts in this memo have 3 modules instead of IPv6 applications, and
   communicate with other IPv6 hosts using IPv4 applications. They are a
   translator, an extension name resolver and an address mapper.

   Figure 1 illustrates the structure of the host in which they are
   installed.

         +----------------------------------------------------------+
         |  +----------------------------------------------------+  |
         |  | IPv4 applications                                  |  |
         |  +----------------------------------------------------+  |
         |  +----------------------------------------------------+  |
         |  | TCP/IPv4                                           |  |
         |  |        +-------------------------------------------+  |
         |  |        |  +-----------+  +---------+  +------------+  |
         |  |        |  | extension |  | address |  | translator |  |
         |  |        |  | name      |  | mapper  |  +------------+  |
         |  |        |  | resolver  |  |         |  +------------+  |
         |  |        |  |           |  |         |  | IPv6       |  |
         |  +--------+  +-----------+  +---------+  +------------+  |
         |  +----------------------------------------------------+  |
         |  | Network card drivers                               |  |
         |  +----------------------------------------------------+  |
         +----------------------------------------------------------+
         +----------------------------------------------------------+
         |    Network cards                                         |
         +----------------------------------------------------------+

               Figure. 1 Structure of the proposed dual stack host









Tsuchiya, et al.             Informational