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Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044156 by Neo on Saturday 15th of February 2020 10:14:42 PM
So, let's try this:

Code:
iptables -A INPUT -s 117.144.138.130/24 -j DROP  #  rogue chinese bot
iptables -A INPUT -s 116.232.49.231/24 -j DROP  #  rogue chinese bot

Empty the "trap" again and block two Chinese subnetworks with rouge, unidentified bot activity.

Honestly, this is starting to "annoy me a lot" in the possibility that these performance hits, and all the time I am spending to find the cause of these hits / spikes, wasting valuable "time in life" is related to rouge, unidentified bots from Chinese networks.

If this continues, I am going to start blocking Chinese networks at the /16 and /8 levels (entire networks).

First, let's see if this is indeed the main source of these spikes. As we all know from situational awareness theory and the famous OODA loop by John Boyd.
  1. OBSERVE
  2. ORIENT
  3. DECIDE
  4. ACT

Already, we have enough information to ACT. But lets continue to OBSERVE Smilie

The loop goes on ... and on ....

Please note that we cannot trust apache2 modules and other third-party software to automatically block IPs, because this can results in blocking the "good bots" which are important for search engine optimization and site traffic.

That means, if this is confirmed that these kinds of bots continue to be the cause of problems, then I will need to DECIDE how to deal with this situation moving forward. I think point in time, I am going to continue to "trap and trace" before making a decision. However, it does seem, at this point, that rouge, unidentified bots from Chinese networks are causing performance issues and need to be "dealt with".

If anyone else has experienced similar issues and has an interesting potential solution to this problem, please reply and share your ideas.

Thanks!

PS: I may consider automating this, as follows:
  1. Capture network session activity when one minute load average exceeds a threshold (as I am doing now).
  2. Filter results captured in the DB based on "hitcount" and "country".
  3. If the "hitcount" exceeds a certain threshold and "country" is in an array of "known to have rouge bots countries".
  4. THEN BLOCK the ip_address/24
 
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