topological "closeness" (RE: Web o' Wonder)

Mike Trest trest at
Mon May 13 17:58:57 UTC 1996

Michael Dillon's Web o' Wonder scenario keys on the ability of smart servers
to do an application level re-direction of load to a topographically more
appropriate server.  Some of our customer's sites are doing a fair job of
this by weighting DNS responses to geographically dispersed sites which,
hopefully, are topographically dispersed.

>Seems to me that this scenario would also benefit from a tool and database
>that could determine topological "closeness" even if it doesn't need to
>generate filter lists.
>If this scenario were easier to implement it could reduce the load of the
>major exchange points by encouraging traffic to stay closer to the network

The CACHE research efforts (see: and others) indicates
that even greater reductions would be obtained if NSP/ISPs increase use of
caches for www. Individual campus statistics, the NLANR prototypes, and
statistics from CACHE sites deployed internationally suggest that
orders-of-magnitude reductions in external network access [i.e. our backbone
load] could be achieved.

I am implementing a CACHE simply to improve on-net customer satisfaction.  I
expect the operational costs to be much less than the equivilent backbone or
transit costs. If it has a side effect of reducting meet point traffic, then
the entire net benefits.

I wonder, how many nets would implement such as cache if the effect would be
to reduce meet point traffic by orders-of-magnitude?

Mike Trest,  ATMNET          Voice:  619 643-1805
5440 Morehouse Drive         Fax:    619 643-1901
San Diego, CA  92121         Pager:  619 960-9070

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