有个 ip 192.121.86.94:80 一直在穷举扫描我的服务器，我该怎么办？

RT，扫描了几个小时了，

类似下面的记录，我该怎么办啊？

root@xxx:~# netstat -an --ip | grep "192.121.86.94"
tcp 0 1 myserverip:46488 192.121.86.94:80 SYN_SENT
tcp 0 1 myserverip:46485 192.121.86.94:80 LAST_ACK
tcp 0 1 myserverip:46487 192.121.86.94:80 SYN_SENT
tcp 0 0 myserverip:46486 192.121.86.94:80 ESTABLISHED
root@xxx:~# netstat -an --ip | grep "192.121.86.94"
tcp 1 1 myserverip:46487 192.121.86.94:80 LAST_ACK
tcp 0 170 myserverip:46492 192.121.86.94:80 ESTABLISHED
tcp 0 0 myserverip:46491 192.121.86.94:80 ESTABLISHED
root@xxx:~# netstat -an --ip | grep "192.121.86.94"
tcp 0 0 myserverip:46502 192.121.86.94:80 ESTABLISHED
tcp 0 0 myserverip:46499 192.121.86.94:80 ESTABLISHED
tcp 0 170 myserverip:46503 192.121.86.94:80 ESTABLISHED
root@xxx:~# netstat -an --ip | grep "192.121.86.94"
tcp 0 0 myserverip:46508 192.121.86.94:80 ESTABLISHED
tcp 0 0 myserverip:46507 192.121.86.94:80 ESTABLISHED
tcp 0 170 myserverip:46509 192.121.86.94:80 ESTABLISHED
root@xxx:~# netstat -an --ip | grep "192.121.86.94"
tcp 0 1 myserverip:46515 192.121.86.94:80 SYN_SENT
tcp 0 1 myserverip:46514 192.121.86.94:80 LAST_ACK
tcp 0 1 myserverip:46516 192.121.86.94:80 SYN_SENT
tcp 0 0 myserverip:46513 192.121.86.94:80 ESTABLISHED
root@xxx:~# netstat -an --ip | grep "192.121.86.94"
tcp 0 0 myserverip:46519 192.121.86.94:80 ESTABLISHED
tcp 0 0 myserverip:46520 192.121.86.94:80 ESTABLISHED
tcp 0 170 myserverip:46521 192.121.86.94:80 ESTABLISHED
root@xxx:~# netstat -an --ip | grep "192.121.86.94"
tcp 0 1 myserverip:46533 192.121.86.94:80 SYN_SENT
tcp 0 1 myserverip:46532 192.121.86.94:80 SYN_SENT
tcp 0 1 myserverip:46530 192.121.86.94:80 LAST_ACK
tcp 0 1 myserverip:46531 192.121.86.94:80 LAST_ACK
tcp 0 0 myserverip:46529 192.121.86.94:80 ESTABLISHED
root@xxx:~# netstat -an --ip | grep "192.121.86.94"
tcp 0 1 myserverip:46756 192.121.86.94:80 LAST_ACK
tcp 0 1 myserverip:46759 192.121.86.94:80 SYN_SENT
tcp 0 0 myserverip:46758 192.121.86.94:80 ESTABLISHED
tcp 0 0 myserverip:46757 192.121.86.94:80 ESTABLISHED