Chris Hastie a écrit : > On Fri, 10 Nov 2006, Guillaume Filion <[EMAIL PROTECTED]> wrote >> Right now the prototype is using the HTTP Geo City Service from MaxMind >> (http://www.maxmind.com/app/web_services_city_usage), so every DNS query >> generates a HTTP query to MaxMind. I've implemented a caching mechanism >> to reduce the number of HTTP queries, but in production this would need >> to be improved. > > I wonder if the "GeoLite" version would be sufficiently accurate, with > the advantage that you could hold the data locally and do away with the > HTTP queries?
That what I used at first, but when GeoLite doesn't find an accurate result, it defaults to coordinates specific for the country (http://www.maxmind.com/app/country_latlon). For example, for Canada, it ends up at 60,-95 i.e.: the middle of the tundra. To mitigate that problem, I set up a GeoLite "blacklist" with fail over to hostip.info. However, the hostip.info data is so unreliable that it didn't provide any real benefit. Since switching to the paid-for version, I did not have a single error caused by IP->lat/lon resolution. Best, GFK's -- Guillaume Filion, ing. jr Logidac Tech., Beaumont, Québec, Canada - http://logidac.com/ PGP Key and more: http://guillaume.filion.org/
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