In message <[EMAIL PROTECTED]>, "Christian
Huitema" writes:
>
>I would think that a study of mechanisms to trace the actual source of
>Internet packets would pass the charter test. After all, there have been
>several proposals to do this by letting the routers mark bits in
>packets, using a probabilistic algorithm. This seem to fall in the
>single problem / existing proposed solution / concrete deliverable
>category.
Yup. But since I'm far from convinced of the feasibility of those
solutions, I chose to propose ICMP Traceback as the preferred
mechanism. The first such scheme, by Savage et al., seems to have too
high a computational complexity, as shown by Song and Perrig. Song and
Perrig have their own, much more efficient scheme, but it requires good
knowledge of Internet topology, and I'm not convinced that that would
be forthcoming. All such schemes suffer from a lack of a place to do
the marking -- using the ID field breaks fragmentation and AH, there's
no place in the v6 header except maybe the flow label, etc.
>
>Indeed, we can also debate whether source tracing is useful...
>
Indeed.
--Steve Bellovin, http://www.research.att.com/~smb
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