Syn flood attack?
Criminal behaviour and should be reported to the police. Not that they would have a clue what to do about it.
You need to set up reapers so that half open TCP connections are dropped fairly quickly. In combination with that, you could do with shifting your syn request table from your host, by storing the information in cookies and tracking connections that way instead.
A lot of network equipment comes with these features built in now adays.
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