As a web host, we frequently find customers who have added Apache rules to their ecommerce sites to block undesirable traffic, such as credit card scammers, etc. Not knowing any better, they often do this by just blocking anything that ends in .in to block Indonesia for example. Well, once you choose to block by resolved name, now that site has to do a dns lookup for every incoming request to see if it resolves to a name that should be blocked.
Another practical problem with this approach is that .IN is India but hey, at least it blocks something :-) -- -Barry Shein, that'd be .ID for Indonesia The World | bzs@TheWorld.com | http://www.TheWorld.com Purveyors to the Trade | Voice: 800-THE-WRLD | Dial-Up: US, PR, Canada Software Tool & Die | Public Access Internet | SINCE 1989 *oo*