what's this for a kind of attack?

Umm, what's this from port sentry?

attackalert: Unknown Type: Packet Flags: SYN: 1 FIN: 1 ACK: 0 PSH: 0 URG: 0 RST: 0 from host: 203.232.4.4/203.232.4.4 to TCP port: 53

 

 

 

 

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