Re: [Boston.pm] OT: look up a host for a URL
On Wed, Sep 22, 2004 at 11:57:35AM +0100, David Cantrell wrote: On Tue, Sep 21, 2004 at 05:56:47PM -0400, Gyepi SAM wrote: Indeed! The as_check script references to routeviews.org and the Merit Routing database, are particularly useful for me since I have recently developed an interest in routing databases. Just remember that the AS number returned by that script may not be *entirely* accurate. It'll tell you who is announcing a particular netblock to routeviews.org, but not who the *real* owner is. For that you need to look at the AS path. It's on my ever-growing to-do list. Thanks for the info.` Out of interest, what project do you have in mind that'll be using this sort of information? I am working on a mirror database program that finds the best n mirrors for a given client IP address. The current selection methods are geographically biased: they prefer mirrors within the client's country, then the closest mirrors in other countries based on, very rough, geographic distance calculations. Most results are surprisingly accurate, but edge cases fail pretty badly since it's working at country granularity: Vancouver, CA is closer to Seattle, US than to Alberta, CA but the latter is selected first. A similar problem occurs for large countries as well. I am thinking that some knowledge of possible routes from the client to the mirror may help here. My initial approach was to write a client utility that can traceroute and ping a list of mirrors to find the closest/fastest ones, but I'd like to precompute some of that information on the server, if possible, using routing tables. -Gyepi ___ Boston-pm mailing list [EMAIL PROTECTED] http://mail.pm.org/mailman/listinfo/boston-pm
[Boston.pm] Print oddity?
Code: #two simple arrays @x = (1,2,4,8); @y = (2,4,8,16); #print both arrays with values joined by , - end with a newline. print (join',',@x), \n; print (join',',@y), \n; #print colinear check math print ((($y[0]-$y[1]) * ($x[0]-$x[2])) - (($y[0]-$y[2]) * ($x[0]-$x[1]))), \n; Output: [EMAIL PROTECTED] ~]$ perl numtest.pl 1,2,4,82,4,8,[EMAIL PROTECTED] ~]$ -Jeff SIG: HUP ___ Boston-pm mailing list [EMAIL PROTECTED] http://mail.pm.org/mailman/listinfo/boston-pm
