Subject: DSR and RIDs

From: "M. Scott Corson" <[email-masked]>
Date: Tue, 8 Sep 1998 15:56:01 -0400 (EDT)

Last week I posted a note on MANET addressing to the group.

Subsequently, I was speaking with Kimberly King of SAIC regarding the note
and some of its implications.  We discussed DSR's practice below:

****

Single IP address with interface indexes (as put forth by DSR)

                       +--------+------------+
                       |        | index (I1) |
                       |        |------------+
                       |        |------------+
                       | router | index (I2) |
                       |  (IP)  |------------+
                       |        |------------+
                       |        | index (I3) |
                       +--------+------------+

Here, the IP address functions as sort of a RID, and the indexes are
added to enable multi-technology routing.

****

She suggested that a resolution of this approach with the RID concept
is the following simple translation:

Let the central IP address indicate a 3-byte prefix.
Let each index form the last byte of the IP address for its interface,
and let the RID be set to one of these interface addresses.

                       +--------+-------+
                       |        | IP.I1 |
                       |        |-------+
                       |        |-------+
                       | RID =  | IP.I2 |
                       | IP.I1  |-------+
                       |        |-------+
                       |        | IP.I3 |
                       +--------+-------+

This is essentially part of a RID/IP address assignment policy (the type of 
policy *not* specified, but allowed, in the architecture) applicable for DSR.
The other part of the policy would require determining *how* to assign the
3-byte prefix and 1-byte indexes for each DSR node.  With this
interpretation, the approach put forth in DSR is the *same* as that posted
in my note last week; i.e., the router is identified by an RID, and each
of its interfaces has an associated IP address.

-Scott

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M. Scott Corson                                 Institute for Systems Research
[email-masked]                              A.V. Williams Bldg. (115)
Phone: 301-405-6630 (Rm. 2205 AVW)              University of Maryland     
Fax:   301-314-8586                             College Park, MD  20742

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