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bat0nas
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What exactly causes 100% CPU load?

Mon Apr 19, 2021 1:22 pm

My router is constantly being DDOS'ed (don't ask me why :) ).
I made some scripts and see that during ddos my CPU is loaded 60% which makes it inaccessible. But in particular CPU 3 is loaded 100% by some firewall operations (from the Profile tool).

How to know exactly what FW rules are being processed?
I would gladly disable those FW rules. Just need to understand what causes router to go down.

PS: ICMP is disabled as a TOP fw rule in my config. So it's something else.
PS2: https://help.mikrotik.com/docs/pages/vi ... d=28606504 this also has been applied. Didn't help.
 
mkx
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Re: What exactly causes 100% CPU load?

Mon Apr 19, 2021 7:53 pm

All FW rules have counters ... check which counter is incrementing the most while under DDOS. Don't blindly disable that rule, result might be vulnerable LAN.
BR,
Metod
 
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Re: What exactly causes 100% CPU load?

Mon Apr 19, 2021 7:59 pm

check if the dns responder is active or not, eventually put a firewall rule.
I'm Italian, not English. Sorry for my imperfect grammar.

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