Re: IP->Country Data (RE: ISP's Contact List)

[Patrick W. Gilmore]

On Jun 13, 2005, at 2:55 PM, william(at)elan.net wrote:

> Commercial service when there are several free ones available....
>
> BTW - based on what I can see they are not updating data once per  
> day but only once/month. Also having some experience in this matter  
> I highly doubt that its much more accurate then what I got - it  
> appears no matter what path you take to get the data, it would to a  
> degree be wrong (difference
> being which part is wrong). One possible way to resolve some issues  
> could
> be to have testing servers placed in several locations and analyze  
> TTL for connections to various ips to determine how far its from  
> several servers -
> of course it would also not be accurate as ip networks are not  
> necessarily interconnecting in the same region (CAIDA did their  
> best with this method
> some time ago but have not kept updated data as far as I know).
Too bad no one has servers in 100s or even a 1000 or more ISPs in  
dozens of countries with TCP connections to a statistically  
significant portion of the Internet on a daily basis who could  
possibly measure, say, RTT (not sure why TTL is relevant) and other  
things, and perhaps use that along with other information to create a  
database that they could then give to customers who need geo-location  
data for their "mission critical" applications.

That would probably be pretty darned accurate.

Of course, that would be a "commercial service"....

=)

--
TTFN,
patrick