Ben Aitchison wrote: > On Thu, May 23, 2002 at 09:36:00AM +1200, Zane Gilmore wrote: > >>Most of us programmers/geeks love to expound our knowledge ;-) >>and we definitely need people who are not afraid of >>asking questions. >> >>Because there are often so many ways of solving a problem, all of >>us often will read answers from others and learn something new, >>no matter the level of expertise. > > > The problem that tends to come up though, is that all the easy answers get > answered and the complicated problems get ignored. This is a trend in > mailing lists in general. I wish I knew an easy answer :)
People are prepared to provide answers from their personal knowledge for free, but not do research projects for free. Unfortunately the easy answer is probably summed up in the sentence "You get what you pay for". > For instance, I want to figure out what country an AS number is in, without > doing mass whois querys. > > Like for instance: > % whois -h whois.apnic.net AS9800 > > Will tell me that that AS number is in China. I'd like to be able to (say) > block all of China from accessing my SMTP port for instance. > > I've got a BGP dump of prefixes to AS numbers, so that I can figure out > what IP subnets belong to which AS number. > > Now this is a challenge to see if anyone has any ideas :P One quite good way of stopping spam is to check the reverse lookup on the DNS. If, as is almost always the case with spam, there is no reverse lookup you can just redirect to /dev/null . It's not 100% proof but together will the other, standard, measures it can be a big help. -- C.
