copy and paste the below code which will drop the incoming udp packets in the respective port.
Code:
iptables -A INPUT -s <attacker IP> -p udp --dport 28960 -j DROP
now copy and paste
Code:
root@box:/sbin/iptables# service iptables save
root@box:/sbin/iptables# service iptables restart
root@box:/sbin/iptables# iptables -L
Hope you use the howto with this rules. Makes some sense , like A = append, p is the protoco, and --dport is the port no etc.
Try making your own rules and test them