You can leverage iptables to reject repeated requests that may be seen as DDOS or rogue players.
iptables -A INPUT -p tcp –dport [port] -i [eth] -m state –state NEW -m recent –set
iptables -A INPUT -p tcp –dport [port] -i [eth] -m state –state NEW -m recent –update –seconds [seconds] –hitcount [total] -j DROP