RADIUS attribute extension formats: Do we understand the proposals?

["Bernard Aboba" <bernard_aboba@hotmail.com>]

In previous mailing list discussion, we have discussed two major proposals 
for RADIUS attribute extension.  This message attempts to summarize the two 
proposals.  Additions/corrections/comments welcome.


1. Glen + David's proposal:

      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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Type      |  Length       |            Vendor-Id
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         Vendor-Id (cont)           | Extended type |    Length2    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Tag      |     Data...
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

 Type

    26 for Vendor-Specific.

 Length

    >= 7

 Vendor-Id

    0 (for Extended Attributes)

 Extended Type

    0:       Reserved
    1-250:   Allocated by IANA
    250-255: Reserved

 Length2

    >=0

    Multiple subattributes MAY be encoded within a single Extended
    Attribute, although they do not have to be.

     Tag

     The Tag field is always present.  Values include:

        0:        Not Used (i.e. attribute is untagged)
        1-255:    Tag value used to aggregate attributes into groups

The value of the Tag field MAY be limited to printable ASCII values,
for ease of human entry and interpretation.

2. Alan DeKok's proposal:


    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |    Length     |            Extended-Type      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Value...
   +-+-+-+-+-+-+-+-+

   Type

      TBD  (not 26)

   Length

      >= 4

   Extended-Type

      Two octets.

      0:  Concatenation
     1-255:  Reserved
     255-65530: Allocated by IANA
     65531-65535:  Reserved

   Value

      0-251 octets (Length - 4).

   Only a single RADIUS Extended-Type attribute may be included within
   a RADIUS attribute of Type TBD.   Where the value of the Extended-Type
   field is zero (0), this indicates that the content of the value field is 
to
   be concatenated with the contents of the value field in the previous
   attribute of Type TBD.



--
to unsubscribe send a message to radiusext-request@ops.ietf.org with
the word 'unsubscribe' in a single line as the message text body.
archive: <http://psg.com/lists/radiusext/>