RFC 2485 (rfc2485) - Page 2 of 4

DHCP Option for The Open Group's User Authentication Protocol

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RFC 2485          DCHP Option for the Open Group's UAP      January 1999


   Most UAP clients have no local state and are configured when booted
   through DHCP.  No existing DHCP option [6] has a data field that
   contains a URL.  Option 72 contains a list of IP addresses for WWW
   servers, but it is not adequate since a port and/or path can not be
   specified.  Hence there is a need for an option that contains a list
   of URLs.

User Authentication Protocol Option

   This option specifies a list of URLs, each pointing to a user
   authentication service that is capable of processing authentication
   requests encapsulated in the User Authentication Protocol (UAP).  UAP
   servers can accept either HTTP 1.1 or SSLv3 connections.  If the list
   includes a URL that does not contain a port component, the normal
   default port is assumed (i.e., port 80 for http and port 443 for
   https).  If the list includes a URL that does not contain a path
   component, the path /uap is assumed.

   0                   1                   2                   3
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Code      |    Length     |   URL list
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Code            98

      Length          The length of the data field (i.e., URL list) in
                      bytes.

      URL list        A list of one or more URLs separated by the ASCII
                      space character (0x20).

References

   [1]  Droms, R., "Dynamic Host Configuration Protocol", RFC 2131,
        March 1997.

   [2]  Technical Standard: Network Computing Client, The Open Group,
        Document Number C801, October 1998.

   [3]  Fielding, R., Gettys, J., Mogul, J., Frystyk, H., and T.
        Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1", RFC
        2068, January 1997.

   [4]  Freier, A., Karlton, P., and P. Kocher, "The SSL Protocol,
        Version 3.0", Netscape Communications Corp., November 1996.
        Standards Information Base, The Open Group,
        http://www.db.opengroup.org/sib.htm#SSL_3.



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