Thanks for your fast reply. The problem is that the attacker
lives in my country, and I am sure he has dynamic IP that
changes everytime he connects to the internet.

I have banned his STEAM ID in all our servers, dunno if that
helps.

I have also installed the following source mods:

           01 "Basic Info Triggers" (1.3.2-dev) by
AlliedModders LLC
           02 "Basic Chat" (1.3.2-dev) by AlliedModders LLC
           03 "Forlix FloodCheck" (1.7) by Forlix (Dominik
Friedrichs)
           04 "RCON Lock" (0.6.6) by devicenull
           05 "Player Commands" (1.3.2-dev) by AlliedModders LLC
           06 "Fun Commands" (1.3.2-dev) by AlliedModders LLC
           07 "Basic Commands" (1.3.2-dev) by AlliedModders LLC
           08 "Admin File Reader" (1.3.2-dev) by AlliedModders LLC
           09 "Client Preferences" (1.3.2-dev) by
AlliedModders LLC
           10 "Basic Votes" (1.3.2-dev) by AlliedModders LLC
           11 "Reserved Slots" (1.3.2-dev) by AlliedModders LLC
           12 "Basic Ban Commands" (1.3.2-dev) by
AlliedModders LLC
           13 "Fun Votes" (1.3.2-dev) by AlliedModders LLC
           14 "Sound Commands" (1.3.2-dev) by AlliedModders LLC
           15 "Admin Help" (1.3.2-dev) by AlliedModders LLC
           16 "Basic Comm Control" (1.3.2-dev) by
AlliedModders LLC
           17 "Admin Menu" (1.3.2-dev) by AlliedModders LLC
           18 "Anti-Flood" (1.3.2-dev) by AlliedModders LLC
           19 <Failed> "Kigen's Anti-Cheat" (1.2.1.0) by Kigen
           20 Disabled: "Nextmap" (1.3.2-dev) by AlliedModders LLC

I dont know why kigen anti cheat fails to load :\

I have also did the following comamnds:

iptables -A INPUT -p udp --dport 27015 -m length --length 28
-j DROP

to all my server ports.


All of this helped because I talked today with the attacker
and he could not crash my server. here is the chat log:


- > BaR - >: so.. you blocked DDOS attack
- > BaR - >: can you block bot netting?
- > BaR - >: i don't think so ;)
- > BaR - >: you'r ports still opren
- > BaR - >: openm*
- > BaR - >: open* -.-
- > BaR - >: #1 you can't block the port "when player join a game"
- > BaR - >: and with this port i can crash..

What does he mean bot netting? and didnt the following
commands blocked the ports:
iptables -A INPUT -p udp --dport 27015 -m length --length 28
-j DROP
?

thanks!

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