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- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!swrinde!elroy.jpl.nasa.gov!dank
- From: dank@blacks.jpl.nasa.gov (Daniel R. Kegel)
- Newsgroups: comp.protocols.tcp-ip
- Subject: Re: Is there a Internet distance measure?
- Message-ID: <dank.715894743@blacks>
- Date: 7 Sep 92 19:39:03 GMT
- References: <dank.715818516@blacks>
- Sender: news@elroy.jpl.nasa.gov (Usenet)
- Organization: Image Analysis Systems Group, JPL
- Lines: 40
- Nntp-Posting-Host: blacks.jpl.nasa.gov
-
- Thanks to all who responded.
- Perhaps I'll send out an ICMP ping packet to all the hosts on the list
- that match some simple heuristic (e.g. same top-level domain preferred),
- and take the first host to respond as the 'closest'.
-
- Eventually, it might be nice to access the SoftPages database to
- determine the answer from global routing info; I hope they make it available
- via some other method than x.500 until that is universally accepted.
- - Dan Kegel
-
- Original question:
- >I'm looking for an automatic way to select the 'nearest'
- >host from a list e.g. such that an Archie client
- >automatically chooses a nearby site rather than one
- >on the other side of the globe.
-
- From: Rahul Dhesi <dhesi@rahul.net>
- >[Use traceroute; it gives # of hops and delay in ms. Rather expensive to run.]
-
- From: Glenn Mansfield <glenn@aic.co.jp>
- > There is a project called the SoftPages project (SPP) which is
- > attempting to solve just this problem- it finds the the closest
- > repository (ftp-server)containing the file sought by a user.
- > It makes use of a X500 based directory service that contains the
- > above mentioned network configuration info.
- > The project is currently in the experimental stage- for more info
- > you can write to spp@aic.co.jp or to join the discussion group
- > write to spp-request@aic.co.jp. Related documents are available
- > from ftp.tohoku.ac.jp in ~ftp/pub/spp .
-
- From: Earle Ake <ake@DAYVC.Dayton.SAIC.COM>
- > I would use the ping utility and traceroute to find the shortest path
- >(traceroute) to a site and the shortest propagation time (ping) to the site.
-
- From: cmaeda@MC8.MACH.CS.CMU.EDU
- >Only heuristic methods (ie you're on your own). In theory, internet
- >domain names have nothing to do with geography. "Near" is also a
- >function of connectivity which is also unrelated to geography.
- >Basically you would have to manage a lot of the kind of information
- >that the internet was designed to let you ignore.
-