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Denial Of Service Attack Update


 
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The Lounge What is on Your Mind? Denial Of Service Attack Update
# 1  
Old 06-12-2019
Denial Of Service Attack Update

Dear All,

We were hit with a denial of service (DOS) attack today beginning around June 12th 2019 @ 01:27:51 PM from an IP address registered to "RACKWEB-NET" in Bulgaria.

I was notified about this around June 12th 2019 @ 03:05 PM and did some log file analysis and discovered how the attack was happening and wrote some code to mitigate against the attack.

I think the site was down for about 1 hour and 19 minutes because of the attack.

The code I wrote will filter against these kinds of DOS attacks in the future.

Thank you for your support,

Neo

EDIT: In addition to the PHP changes, I made some changes to the DB configuration as well to help insure this kind of attack cannot succeed in the future.
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# 2  
Old 06-13-2019
Still have some issues with bots... will keep a close eye on it.
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# 3  
Old 06-15-2019
Today (Saturday), have made some MySQL configuration changes, which I hope will help mitigate DB issues when hit by "rogue bots" who do not "follow the rules" (robots.txt).

That's all the MySQL DB changes for this weekend.
# 4  
Old 06-16-2019
Update:

MySQL config changes seems to have "lowered the temperature" of the CPU a bit, and MySQL is using less CPU.

Let's see how this holds during the busy weekdays.
# 5  
Old 06-18-2019
Still tuning MySQL.
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