I try to help a lot of people with this

Its useless to put a kind of that plugin on your server, why?
Because there are a lot of floods who don't need more IPs...They're need 1 IP and fake players will have different STEAM_ID!
I can help you with this cause I've that flood, its created by russians and solution was created by cyby(romanian guy); If you are running
STEAM ON server these may can help you

Follow these steps:
1. Remove motd.txt from your server (you will find it in cstrike folder, you don't need this anyway,
some flood works through motd and players will enter fast without click on ok in motd;
2. Go to amxmodx/configs/plugins.ini and find a line called: adminhelp.amxx, put ; in front of this plugin so will be: ;adminhelp.amxx
3. Where you have host server, they have no server protection?
4. If they're connected a lot of bots (fake players), try to ban that IP, probably he's got dynamic IP but temporarily you can ban him.
5. Do not use ghostchat.amxx (plugin who make players speak in chat when they are dead or alive, in this plugin there is a bug through the flooders can crash your server)!
6. Use these plugins below, it will help you!
Good luck boy!