Seoul-105
                                                            1998.6.19
                                                       Akria Mizushima

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       APAN's Roaming Services
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== for the mobile laboratory by the global computing environment ==

                                          

1. What is the motive to propose APAN's Roaming Services?
   Anytime anywhere, the international "Migrant" researchers
   under APAN want to access their "own" computer through the high
   performance network.  APAN's Roaming Services provide for them a
   global remote access to their "own" computer.

2. Why is APAN's Roaming Services necessary?
      By Commercial Internet service provider or International
      long-distance call,
        - Limitation on the services
        - Expensive
        - Data error
        - May be limitation in the use of mother tongue
        - Dialing may difficult in the hotel
   Moreover, because the regular user can be neatly distinguished,
   the measure to the network intruder and SPAM can be strengthened.

3. How realize APAN's Roaming Services?
        <Simple model>
                   Name        Authentication server   Name    
                   Server      for Roaming Services    Server
                    | +---- +           | |              | |
                    +-----+ |           | |              | | 
                          | |           | |              | |
 -------------------------+-+-----------+-+--------------+-+------
   Migrant Researcher   Abroad         APAN-XP       Homeland
 -----------------------------------------------------------------
                          User unknown      Okay,        Okay, this
       Login ---------+-> but forward --+-> Please --+-> is our User
                      |   to APAN-XP    |   check    |          |
                      |                 |            |          |
                   Unknown            Unknown       Unknown     |
                  Who are you?       Who are you?  Who are you? |
                      |                 |            |          |
        Pshaw!  <-----+-----------------+------------+          |
                                                                |
                      I understand,                             |
      Thank you! <--- you can logon <------ Okay <--------------+ 
                      for your home-
                      land computer

4. What problems in APAN's Roaming Services?
        - Access points
        - User authentication
        - Security
        - Cost sharing for Authentication server
        etc.