The update of the Multiping module for Drupal is now available on this site! I've been running it for three weeks now and it didn't cause any trouble, so I hope it will work fine on your site(s), too.
I've been experiencing some trackback spam floods recently, so I'm trying some new means of filtering:

• The server mentioned in the trackback link must resolve to an IP in the same subnet as the IP sending the trackback
• The page to which the trackback link refers must contain the URL of my site

Please help me testing this scheme: Write a blog entry with a link to my page, and send a trackback here. If the trackback doesn't get through, please drop a comment here. I'm curious whether this will work...