Referrer Karma
`Referrer Karma is a rather simple script that prevents malicious bots from accessing your pages, flooding your logs and possibly draining your server’s bandwidth. All it does is check that an incoming bot has a valid referrer field URL (i.e. that the page it claims to come from, does exist and does have a link to your site). If RK thinks the incoming visitor is a malicious bot, it displays a 403 error page (which will not be counted as a visit by log analyzer tools) and uses HTML redirecting to the original URL to avoid blocking legitimate visitors (See below for details).’
I’ve been getting a lot of referrer spam lately. Hopefully this will help out a bit..
