by Flemming Funch
I finally figured out what had been overloaded my server here for weeks. I had previously noticed that an extraordinary amount of trackback spam is arriving all the time. I had turned off that option for my own blog here, so that trackback would receive a "not found" error. But it was sent by a PHP page, so the server still had to do a bit of processing, which was enough to slow everything down.
My own weblog here is getting 5-10 trackback requests per second, 24-7, all of which are nothing but spam.
I now set up a rewrite filter in Apache, which gives back a "refused" error. The same amount of trackbacks keep arriving, from some kind of botnet of 100s of computers, but this takes much less processor power, so it doesn't matter much.
Trackback used to be a neat feature, allowing weblogs to notify other weblogs that one links to them. But it has been totally useless for quite some time, with the ridiculous amount of phony spam trackbacks.
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