Help to stop flooding

Hello, I have CS 1.6 server but since some days ago a guy started to flood my server. He is not flooding the internet but the server itself (this is what my provider told me). When I start the server after some time he starts flooding and my comp is blocking so i cant do anything. When I remove the internet cable then comp is working OK. Can you please tell me how to forbid the access of this ip to my computer with comodo firewall?

You may want to block his IP via Router Configuration not through a software firewall;


If you wish to block his IP with CFW
CIS > Firewall > Network Security Policy > Blocked Zones (tab) > Add > New Blocked Address > whether It’s IPv6/v4 Single Address > Enter his IP address > Apply > Ok > Close CFW GUI