First, make sure you have a robots.txt file that tells well-behaved indexers to stop messing with you (that'll fix the yahoos and googles of the world, which hammer machines unless told to stop). Second, see if your network people can enable application-layer rate limiting (that's the Cisco term for it; other vendors have similar capabilities). That will throttle repeated requests from single IP addresses to a reasonable level. If these two items don't help, then you can use LVS (Linux Virtual Servers) to impose a rate limit, but that will cost more CPU. LVS is a very good thing to put on an outboard Intel box; it can get very CPU-intensive. If none of these things work: change the IP address of the server regularly and force people to depend on DNS to access it. 8-)
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