I HIGHLY doubt this is search engine robots.
You checked your error log...I want you to check your access logs. This is a ton of data, but you can use open source programs to filter it based upon parameters. You might find thousands of requests for a single page, which you can then block in the .htaccess, which will help with ram. I still think you should look at outbound logs lot make certain you don't have a Bank of America login page being hosted on an obscure folder on your server. You might be sending php phishing emails without your knowledge.
Also, I HIGHLY recommend you use a list of IP blocks, such as one found at countryipblocks.net. This will automatically block ALL users from a certain country. Be careful which countries you block, since the world is our campus.
With the captcha in vbulletin, you can ask a custom question that only live humans would know, such as "who was the greatest BYU football coach of all time". It is part of the standard VB package.
You checked your error log...I want you to check your access logs. This is a ton of data, but you can use open source programs to filter it based upon parameters. You might find thousands of requests for a single page, which you can then block in the .htaccess, which will help with ram. I still think you should look at outbound logs lot make certain you don't have a Bank of America login page being hosted on an obscure folder on your server. You might be sending php phishing emails without your knowledge.
Also, I HIGHLY recommend you use a list of IP blocks, such as one found at countryipblocks.net. This will automatically block ALL users from a certain country. Be careful which countries you block, since the world is our campus.
With the captcha in vbulletin, you can ask a custom question that only live humans would know, such as "who was the greatest BYU football coach of all time". It is part of the standard VB package.
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